<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2021v4.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2022-09-19T14:48:42-04:00</ReturnTs>
    <TaxPeriodEndDt>2021-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>232213999</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>HAMILTON &amp; MUSSER PC CPAS</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>176 CUMBERLAND PARKWAY</AddressLine1Txt>
        <CityNm>MECHANICSBURG</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>17055</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2021-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>231997152</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>MECHANICSBURG MUSEUM ASSOCIATION</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>MECH</BusinessNameControlTxt>
      <PhoneNum>7176976088</PhoneNum>
      <USAddress>
        <AddressLine1Txt>2 WEST STRAWBERRY ALLEY</AddressLine1Txt>
        <CityNm>MECHANICSBURG</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>17055</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>LINDA WILLIS</PersonNm>
      <PersonTitleTxt>PRESIDENT</PersonTitleTxt>
      <PhoneNum>7176976088</PhoneNum>
      <SignatureDt>2022-09-15</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>LINDA</PersonFirstNm>
        <PersonLastNm>WILLIS</PersonLastNm>
      </PersonFullName>
      <SSN>XXX-XX-XXXX</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>MARK S MCNALLY CPA</PreparerPersonNm>
      <PTIN>P01678111</PTIN>
      <PhoneNum>7176973888</PhoneNum>
      <PreparationDt>2022-09-15</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2021</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="6">
    <IRS990 documentId="RetDoc2" referenceDocumentId="RetDoc5">
      <PrincipalOfficerNm>LINDA WILLIS</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>2 W STRAWBERRY ALLEY</AddressLine1Txt>
        <CityNm>MECHANICSBURG</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>17055</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>106540</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>false</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>MECHANICSBURGMUSEUM.ORG</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1976</FormationYr>
      <LegalDomicileStateCd>PA</LegalDomicileStateCd>
      <ActivityOrMissionDesc>PRESERVE LOCAL HISTORY OF MECHANICSBURG, PENNSYLVANIA THROUGH THE PRESERVATION AND RESTORATION OF HISTORICAL BUILDINGS IN THE COMMUNITY AND EDUCATION OF THE PUBLIC OF THE SIGNIFICANCE AND HISTORICAL IMPORTANCE OF THESE STRUCTURES AND THEIR CONTENTS TO THE COMMUNITY.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>11</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>11</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>2</TotalEmployeeCnt>
      <TotalVolunteersCnt>70</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <PYContributionsGrantsAmt>80397</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>69785</CYContributionsGrantsAmt>
      <CYProgramServiceRevenueAmt>0</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>2816</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>9889</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>5553</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>10661</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>88766</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>90335</CYTotalRevenueAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>15263</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>16651</CYSalariesCompEmpBnftPaidAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>1819</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>69687</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>73130</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>84950</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>89781</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>3816</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>554</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>949472</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>992581</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>1450</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>1328</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>948022</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>991253</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <MissionDesc>PRESERVE LOCAL HISTORY OF MECHANICSBURG, PENNSYLVANIA THROUGH THE PRESERVATION AND RESTORATION OF HISTORICAL BUILDINGS IN THE COMMUNITY AND EDUCATION OF THE PUBLIC OF THE SIGNIFICANCE AND HISTORICAL IMPORTANCE OF THESE STRUCTURES AND THEIR CONTENTS TO THE COMMUNITY.</MissionDesc>
      <SignificantNewProgramSrvcInd>false</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>false</SignificantChangeInd>
      <ExpenseAmt>64455</ExpenseAmt>
      <Desc>REGULARLY HAVE DISPLAYS AND FORUMS OF HISTORY OF THE LOCAL AREA. NEWSLETTERS KEEP MEMBERS UPDATED ON ACTIVITIES.</Desc>
      <TotalProgramServiceExpensesAmt>64455</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc6">true</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd referenceDocumentId="RetDoc1">true</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd referenceDocumentId="RetDoc3">false</DonorAdvisedFundInd>
      <ConservationEasementsInd referenceDocumentId="RetDoc3">false</ConservationEasementsInd>
      <CollectionsOfArtInd referenceDocumentId="RetDoc3">true</CollectionsOfArtInd>
      <CreditCounselingInd referenceDocumentId="RetDoc3">false</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd referenceDocumentId="RetDoc3">true</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="RetDoc3">true</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd referenceDocumentId="RetDoc3">false</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd referenceDocumentId="RetDoc3">false</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd referenceDocumentId="RetDoc3">true</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd referenceDocumentId="RetDoc3">false</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd referenceDocumentId="RetDoc3">true</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd referenceDocumentId="RetDoc3">false</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd referenceDocumentId="RetDoc3">false</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <ForeignActivitiesInd>false</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>false</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>false</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd referenceDocumentId="RetDoc4">false</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd referenceDocumentId="RetDoc4">true</FundraisingActivitiesInd>
      <GamingActivitiesInd referenceDocumentId="RetDoc4">false</GamingActivitiesInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <GrantsToOrganizationsInd>false</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>false</GrantsToIndividualsInd>
      <ScheduleJRequiredInd>false</ScheduleJRequiredInd>
      <TaxExemptBondsInd>false</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>false</PYExcessBenefitTransInd>
      <LoanOutstandingInd>false</LoanOutstandingInd>
      <GrantToRelatedPersonInd>false</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>false</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>false</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>false</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>false</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>false</DeductibleArtContributionInd>
      <TerminateOperationsInd>false</TerminateOperationsInd>
      <PartialLiquidationInd>false</PartialLiquidationInd>
      <DisregardedEntityInd>false</DisregardedEntityInd>
      <RelatedEntityInd>false</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>false</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>true</ScheduleORequiredInd>
      <IRPDocumentCnt>0</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <EmployeeCnt>2</EmployeeCnt>
      <EmploymentTaxReturnsFiledInd>true</EmploymentTaxReturnsFiledInd>
      <UnrelatedBusIncmOverLimitInd>false</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>false</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>false</NondeductibleContributionsInd>
      <IndoorTanningServicesInd>false</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>false</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>false</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>11</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>11</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>false</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>false</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>false</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>false</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>false</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>false</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>false</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>true</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>true</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>false</OfficerMailingAddressInd>
      <LocalChaptersInd>false</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>true</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>true</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>true</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>true</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>false</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>false</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>false</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>false</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>false</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>PA</StatesWhereCopyOfReturnIsFldCd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <PersonNm>SANDRA SHOWERS</PersonNm>
        <PhoneNum>7176976088</PhoneNum>
        <USAddress>
          <AddressLine1Txt>2 WEST STRAWBERRY ALLEY</AddressLine1Txt>
          <CityNm>MECHANICSBURG</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>17055</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>LINDA WILLIS</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>FRANKIE HENSEL</PersonNm>
        <TitleTxt>IM PAST PRES</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTINE DIXON</PersonNm>
        <TitleTxt>VICE PRESIDE</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>FAITH MATTHEWS</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>SANDY SHOWERS</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>3900</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHERYL HOKE</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAT BERKHEIMER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DENNIS REHM</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAM WEAVER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>VIRGINIA HERRING</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>GARY TURNBAUGH</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JEANNE SOUDER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>STEVE ZIMMERMAN</PersonNm>
        <TitleTxt>MUSEUM DIREC</TitleTxt>
        <AverageHoursPerWeekRt>7.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>3900</TotalReportableCompFromOrgAmt>
      <FormerOfcrEmployeesListedInd>false</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>false</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <MembershipDuesAmt>18870</MembershipDuesAmt>
      <GovernmentGrantsAmt>5000</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>45915</AllOtherContributionsAmt>
      <TotalContributionsAmt>69785</TotalContributionsAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>9889</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>9889</RelatedOrExemptFuncIncomeAmt>
      </InvestmentIncomeGrp>
      <FundraisingGrossIncomeAmt>20467</FundraisingGrossIncomeAmt>
      <FundraisingDirectExpensesAmt>14668</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>5799</TotalRevenueColumnAmt>
        <ExclusionAmt>5799</ExclusionAmt>
      </NetIncmFromFundraisingEvtGrp>
      <GrossSalesOfInventoryAmt>4277</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>1537</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>2740</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2740</RelatedOrExemptFuncIncomeAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>DISTRIBUTIONS FROM TRUST</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>1633</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1633</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>MISCELLANEOUS INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>489</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>489</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>2122</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>90335</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>14751</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>5799</ExclusionAmt>
      </TotalRevenueGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>3900</TotalAmt>
        <ProgramServicesAmt>426</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3048</ManagementAndGeneralAmt>
        <FundraisingAmt>426</FundraisingAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>11568</TotalAmt>
        <ProgramServicesAmt>1264</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9040</ManagementAndGeneralAmt>
        <FundraisingAmt>1264</FundraisingAmt>
      </OtherSalariesAndWagesGrp>
      <PayrollTaxesGrp>
        <TotalAmt>1183</TotalAmt>
        <ProgramServicesAmt>129</ProgramServicesAmt>
        <ManagementAndGeneralAmt>925</ManagementAndGeneralAmt>
        <FundraisingAmt>129</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>7400</TotalAmt>
        <ManagementAndGeneralAmt>7400</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <AdvertisingGrp>
        <TotalAmt>2214</TotalAmt>
        <ProgramServicesAmt>2214</ProgramServicesAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>9653</TotalAmt>
        <ProgramServicesAmt>9170</ProgramServicesAmt>
        <ManagementAndGeneralAmt>483</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <OccupancyGrp>
        <TotalAmt>31723</TotalAmt>
        <ProgramServicesAmt>30137</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1586</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>10954</TotalAmt>
        <ProgramServicesAmt>10406</ProgramServicesAmt>
        <ManagementAndGeneralAmt>548</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>9539</TotalAmt>
        <ProgramServicesAmt>9062</ProgramServicesAmt>
        <ManagementAndGeneralAmt>477</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>EXHIBIT COSTS</Desc>
        <TotalAmt>1547</TotalAmt>
        <ProgramServicesAmt>1547</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>DONATIONS</Desc>
        <TotalAmt>100</TotalAmt>
        <ProgramServicesAmt>100</ProgramServicesAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>89781</TotalAmt>
        <ProgramServicesAmt>64455</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23507</ManagementAndGeneralAmt>
        <FundraisingAmt>1819</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>237868</BOYAmt>
        <EOYAmt>84329</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <LandBldgEquipCostOrOtherBssAmt>356770</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>170931</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>112420</BOYAmt>
        <EOYAmt>185839</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <EOYAmt>145957</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <InvestmentsOtherSecuritiesGrp>
        <EOYAmt>40244</EOYAmt>
      </InvestmentsOtherSecuritiesGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>599184</BOYAmt>
        <EOYAmt>536212</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>949472</BOYAmt>
        <EOYAmt>992581</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>1450</BOYAmt>
        <EOYAmt>1328</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>1450</BOYAmt>
        <EOYAmt>1328</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>854539</BOYAmt>
        <EOYAmt>880002</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>93483</BOYAmt>
        <EOYAmt>111251</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>948022</BOYAmt>
        <EOYAmt>991253</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>949472</BOYAmt>
        <EOYAmt>992581</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>554</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>4109</NetUnrlzdGainsLossesInvstAmt>
      <PriorPeriodAdjustmentsAmt>38568</PriorPeriodAdjustmentsAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>true</AccountantCompileOrReviewInd>
      <AcctCompileOrReviewBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </AcctCompileOrReviewBasisGrp>
      <FSAuditedInd>false</FSAuditedInd>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc6">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>81688</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>141295</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>68502</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>80397</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>69785</CurrentTaxYearAmt>
        <TotalAmt>441667</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
        <CurrentTaxYearMinus4YearsAmt>90866</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>41953</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>38668</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>22224</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>36755</CurrentTaxYearAmt>
        <TotalAmt>230466</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>172554</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>183248</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>107170</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>102621</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>106540</CurrentTaxYearAmt>
        <TotalAmt>672133</TotalAmt>
      </Total509Grp>
      <PublicSupportTotal509Amt>672133</PublicSupportTotal509Amt>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>172554</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>183248</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>107170</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>102621</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>106540</CurrentTaxYearAmt>
        <TotalAmt>672133</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>1.00000</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>1.00000</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.00000</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.00000</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc3">
      <ArtPublicExhibitionAmountsGrp>
        <AssetsIncludedAmt>536212</AssetsIncludedAmt>
      </ArtPublicExhibitionAmountsGrp>
      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
        <BeginningYearBalanceAmt>128213</BeginningYearBalanceAmt>
        <ContributionsAmt>5422</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>12322</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>145957</EndYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>115133</BeginningYearBalanceAmt>
        <ContributionsAmt>3054</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>10026</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>128213</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>95539</BeginningYearBalanceAmt>
        <ContributionsAmt>9049</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>10545</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>115133</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>62931</BeginningYearBalanceAmt>
        <ContributionsAmt>36046</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-3438</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>95539</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>57399</BeginningYearBalanceAmt>
        <ContributionsAmt>5522</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>10</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>62931</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.72590</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.27410</PrmnntEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>true</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>346767</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>160928</DepreciationAmt>
        <BookValueAmt>185839</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>10003</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>10003</DepreciationAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>185839</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>HISTORICAL BUILDINGS</Desc>
        <BookValueAmt>536212</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>536212</TotalBookValueOtherAssetsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 2, PART III, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MECHANCISBURG MUSEUM ASSOCIATION WAS FOUNDED IN 1975 IN A COMMUNITY EFFORT TO PRESERVE THE STATIONMASTER'S HOUSE, A HISTORICAL MECHANICSBURG LANDMARK FROM DESTRUCTION. SINCE ITS INCEPTION, THE ASSOCIATION HAS PRESERVED AND PROMOTED MECHANICBURG'S UNIQUE HISTORY WITH EDUCATIONAL PROGRAMS, GALLERY EXHIBITS, AND BY ACQUIRING FOUR MORE HISTORIC BUILDINGS IN THE AREA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 2, PART V, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>PRESERVATION FUND - TO PRESERVE HISTORICAL ASSETS IN LOCAL COMMUNITY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ASSOCIATION IS EXEMPT FROM FEDERAL INCOME TAX AS PROVIDED BY CODE SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. ACCORDINGLY, NO INCOME TAX IS INCURRED UNLESS THE ASSOCIATION EARNS INCOME CONSIDERED TO BE UNRELATED BUSINESS INCOME. THE ASSOCIATION CONDUCTED NO ACTIVITIES THAT WERE SUBJECT TO INCOME TAX. MANAGEMENT EVALUATED THE TAX POSITIONS TAKEN AND CONCLUDED THAT THE ASSOCIATION HAD TAKEN NO UNCERTAIN TAX POSITIONS THAT REQUIRE RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS. NO PROVISION OR BENEFIT FOR INCOME TAXES HAS BEEN INCLUDED IN THESE FINANCIAL STATEMENTS. WITH FEW EXCEPTIONS, THE ASSOCIATION IS NO LONGER SUBJECT TO INCOME TAX EXAMINATIONS BY THE U.S. FEDERAL, STATE OR LOCAL TAX AUTHORITIES FOR YEARS BEFORE DECEMBER 31, 2018.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc4">
      <FundraisingEventInformationGrp>
        <Event1Nm>BLUEBERRY SALES</Event1Nm>
        <GrossReceiptsEvent1Amt>16158</GrossReceiptsEvent1Amt>
        <GrossRevenueEvent1Amt>16158</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>13733</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>16158</GrossReceiptsTotalAmt>
        <GrossRevenueTotalEventsAmt>16158</GrossRevenueTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>13733</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>13733</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>2425</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="RetDoc5">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>PRESERVE LOCAL HISTORY OF MECHANICSBURG, PENNSYLVANIA THROUGH THE PRESERVATION AND RESTORATION OF HISTORICAL BUILDINGS IN THE COMMUNITY AND EDUCATION OF THE PUBLIC OF THE SIGNIFICANCE AND HISTORICAL IMPORTANCE OF THESE STRUCTURES AND THEIR CONTENTS TO THE COMMUNITY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE PRESIDENT AND THE TREASURER, THEN PRESENTED TO THE BOARD OF DIRECTORS FOR REVIEW AND APPROVAL PRIOR TO FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL BOARD MEMBERS ARE REQUIRED TO COMPLETE AND FILE ANNUAL CONFLICT OF INTEREST DISCLOSURE FORMS WITH THE ASSOCIATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>UPON REQUEST AT ORGANIZATION'S OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
