<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2020v4.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2021-06-10T09:40:58-05:00</ReturnTs>
    <TaxPeriodEndDt>2020-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>752678894</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>STOVALL GRANDEY &amp; ALLEN LLP</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>500 W 7TH ST SUITE 900 UNIT 51</AddressLine1Txt>
        <CityNm>FORT WORTH</CityNm>
        <StateAbbreviationCd>TX</StateAbbreviationCd>
        <ZIPCd>761024702</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990PF</ReturnTypeCd>
    <TaxPeriodBeginDt>2020-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>205606198</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>JOHN&amp;MARYANNE MCCORMACK FOUNDATION</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>JOHN</BusinessNameControlTxt>
      <PhoneNum>7139848800</PhoneNum>
      <USAddress>
        <AddressLine1Txt>1303 CAMPBELL ROAD</AddressLine1Txt>
        <CityNm>HOUSTON</CityNm>
        <StateAbbreviationCd>TX</StateAbbreviationCd>
        <ZIPCd>770556403</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>JOHN W MCCORMACK</PersonNm>
      <PersonTitleTxt>PRESIDENT</PersonTitleTxt>
      <PhoneNum>7139848800</PhoneNum>
      <SignatureDt>2021-05-30</SignatureDt>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>JOHN W</PersonFirstNm>
        <PersonLastNm>MCCORMACK</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>BRENDA J YOUNG</PreparerPersonNm>
      <PTIN>P01066644</PTIN>
      <PhoneNum>8176322500</PhoneNum>
      <PreparationDt>2021-05-30</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2020</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="2">
    <IRS990PF documentId="RetDoc2">
      <Organization501c3ExemptPFInd>X</Organization501c3ExemptPFInd>
      <FMVAssetsEOYAmt>717351</FMVAssetsEOYAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AnalysisOfRevenueAndExpenses>
        <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
        <TotalRevAndExpnssAmt>0</TotalRevAndExpnssAmt>
        <TotalNetInvstIncmAmt>0</TotalNetInvstIncmAmt>
        <TotOprExpensesRevAndExpnssAmt>0</TotOprExpensesRevAndExpnssAmt>
        <TotOprExpensesNetInvstIncmAmt>0</TotOprExpensesNetInvstIncmAmt>
        <TotOprExpensesDsbrsChrtblAmt>0</TotOprExpensesDsbrsChrtblAmt>
        <ContriPaidRevAndExpnssAmt>40000</ContriPaidRevAndExpnssAmt>
        <ContriPaidDsbrsChrtblAmt>40000</ContriPaidDsbrsChrtblAmt>
        <TotalExpensesRevAndExpnssAmt>40000</TotalExpensesRevAndExpnssAmt>
        <TotalExpensesNetInvstIncmAmt>0</TotalExpensesNetInvstIncmAmt>
        <TotalExpensesDsbrsChrtblAmt>40000</TotalExpensesDsbrsChrtblAmt>
        <ExcessRevenueOverExpensesAmt>-40000</ExcessRevenueOverExpensesAmt>
        <NetInvestmentIncomeAmt>0</NetInvestmentIncomeAmt>
      </AnalysisOfRevenueAndExpenses>
      <Form990PFBalanceSheetsGrp>
        <CashBOYAmt>747351</CashBOYAmt>
        <CashEOYAmt>717351</CashEOYAmt>
        <CashEOYFMVAmt>717351</CashEOYFMVAmt>
        <TotalAssetsBOYAmt>747351</TotalAssetsBOYAmt>
        <TotalAssetsEOYAmt>717351</TotalAssetsEOYAmt>
        <TotalAssetsEOYFMVAmt>717351</TotalAssetsEOYFMVAmt>
        <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
        <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
        <NoDonorRstrNetAssestsBOYAmt>747351</NoDonorRstrNetAssestsBOYAmt>
        <NoDonorRstrNetAssestsEOYAmt>717351</NoDonorRstrNetAssestsEOYAmt>
        <TotNetAstOrFundBalancesBOYAmt>747351</TotNetAstOrFundBalancesBOYAmt>
        <TotNetAstOrFundBalancesEOYAmt>717351</TotNetAstOrFundBalancesEOYAmt>
        <TotalLiabilitiesNetAstBOYAmt>747351</TotalLiabilitiesNetAstBOYAmt>
        <TotalLiabilitiesNetAstEOYAmt>717351</TotalLiabilitiesNetAstEOYAmt>
      </Form990PFBalanceSheetsGrp>
      <ChgInNetAssetsFundBalancesGrp>
        <TotNetAstOrFundBalancesBOYAmt>747351</TotNetAstOrFundBalancesBOYAmt>
        <ExcessRevenueOverExpensesAmt>-40000</ExcessRevenueOverExpensesAmt>
        <OtherIncreasesAmt referenceDocumentId="RetDoc1">10000</OtherIncreasesAmt>
        <SubtotalAmt>717351</SubtotalAmt>
        <TotNetAstOrFundBalancesEOYAmt>717351</TotNetAstOrFundBalancesEOYAmt>
      </ChgInNetAssetsFundBalancesGrp>
      <ExciseTaxBasedOnInvstIncmGrp>
        <InvestmentIncomeExciseTaxAmt>0</InvestmentIncomeExciseTaxAmt>
      </ExciseTaxBasedOnInvstIncmGrp>
      <StatementsRegardingActyGrp>
        <LegislativePoliticalActyInd>false</LegislativePoliticalActyInd>
        <MoreThan100SpentInd>false</MoreThan100SpentInd>
        <Form1120POLFiledInd>false</Form1120POLFiledInd>
        <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
        <ChangesToArticlesOrBylawsInd>false</ChangesToArticlesOrBylawsInd>
        <UnrelatedBusIncmOverLimitInd>false</UnrelatedBusIncmOverLimitInd>
        <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
        <AtLeast5000InAssetsInd>true</AtLeast5000InAssetsInd>
        <OrgReportOrRegisterStateCd>TX</OrgReportOrRegisterStateCd>
        <Form990PFFiledWithAttyGenInd>true</Form990PFFiledWithAttyGenInd>
        <PrivateOperatingFoundationInd>false</PrivateOperatingFoundationInd>
        <NewSubstantialContributorsInd>false</NewSubstantialContributorsInd>
        <OwnControlledEntityInd>false</OwnControlledEntityInd>
        <DonorAdvisedFundInd>false</DonorAdvisedFundInd>
        <ComplyWithPublicInspRqrInd>true</ComplyWithPublicInspRqrInd>
        <WebsiteAddressTxt>N/A</WebsiteAddressTxt>
        <IndividualWithBooksNm>JOHN M MCCORMACK</IndividualWithBooksNm>
        <PhoneNum>7139848800</PhoneNum>
        <LocationOfBooksUSAddress>
          <AddressLine1Txt>1303 CAMPBELL ROAD</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>770556403</ZIPCd>
        </LocationOfBooksUSAddress>
        <ForeignAccountsQuestionInd>false</ForeignAccountsQuestionInd>
      </StatementsRegardingActyGrp>
      <StatementsRegardingActy4720Grp>
        <SaleOrExchDisqualifiedPrsnInd>false</SaleOrExchDisqualifiedPrsnInd>
        <BrrwOrLendDisqualifiedPrsnInd>false</BrrwOrLendDisqualifiedPrsnInd>
        <FurnGoodsDisqualifiedPrsnInd>false</FurnGoodsDisqualifiedPrsnInd>
        <PayCompDisqualifiedPrsnInd>false</PayCompDisqualifiedPrsnInd>
        <TransferAstDisqualifiedPrsnInd>false</TransferAstDisqualifiedPrsnInd>
        <PaymentToGovernmentOfficialInd>false</PaymentToGovernmentOfficialInd>
        <UndistributedIncomePYInd>false</UndistributedIncomePYInd>
        <BusinessHoldingsInd>false</BusinessHoldingsInd>
        <InfluenceLegislationInd>false</InfluenceLegislationInd>
        <InfluenceElectionInd>false</InfluenceElectionInd>
        <GrantsToIndividualsInd>false</GrantsToIndividualsInd>
        <GrantsToOrganizationsInd>false</GrantsToOrganizationsInd>
        <NoncharitablePurposeInd>false</NoncharitablePurposeInd>
        <RcvFndsToPayPrsnlBnftCntrctInd>false</RcvFndsToPayPrsnlBnftCntrctInd>
        <PayPremiumsPrsnlBnftCntrctInd>false</PayPremiumsPrsnlBnftCntrctInd>
        <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
        <SubjToTaxRmnrtnExPrchtPymtInd>false</SubjToTaxRmnrtnExPrchtPymtInd>
      </StatementsRegardingActy4720Grp>
      <OfficerDirTrstKeyEmplInfoGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>JOHN MCCORMACK</PersonNm>
          <USAddress>
            <AddressLine1Txt>1303 CAMBPELL ROAD</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>770556403</ZIPCd>
          </USAddress>
          <TitleTxt>VICE PRESIDE</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>MARYANNE MCCORMACK</PersonNm>
          <USAddress>
            <AddressLine1Txt>1303 CAMPBELL ROAD</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>770556403</ZIPCd>
          </USAddress>
          <TitleTxt>VICE PRESIDE</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>DAURICE WHITE</PersonNm>
          <USAddress>
            <AddressLine1Txt>1303 CAMPBELL ROAD</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>770556403</ZIPCd>
          </USAddress>
          <TitleTxt>TREASURER</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <OfficerDirTrstKeyEmplGrp>
          <PersonNm>JOHN W MCCORMACK</PersonNm>
          <USAddress>
            <AddressLine1Txt>1303 CAMPBELL RD</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>77055</ZIPCd>
          </USAddress>
          <TitleTxt>PRESIDENT</TitleTxt>
          <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
          <CompensationAmt>0</CompensationAmt>
          <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
          <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
        </OfficerDirTrstKeyEmplGrp>
        <CompOfHghstPdEmplOrNONETxt>NONE</CompOfHghstPdEmplOrNONETxt>
        <CompOfHghstPdCntrctOrNONETxt>NONE</CompOfHghstPdCntrctOrNONETxt>
      </OfficerDirTrstKeyEmplInfoGrp>
      <SumOfProgramRelatedInvstGrp>
        <Description1Txt>N/A</Description1Txt>
      </SumOfProgramRelatedInvstGrp>
      <MinimumInvestmentReturnGrp>
        <AverageMonthlyFMVOfSecAmt>0</AverageMonthlyFMVOfSecAmt>
        <AverageMonthlyCashBalancesAmt>759351</AverageMonthlyCashBalancesAmt>
        <FMVAllOtherNoncharitableAstAmt>0</FMVAllOtherNoncharitableAstAmt>
        <TotalFMVOfUnusedAssetsAmt>759351</TotalFMVOfUnusedAssetsAmt>
        <AdjustedTotalFMVOfUnusedAstAmt>759351</AdjustedTotalFMVOfUnusedAstAmt>
        <CashDeemedCharitableAmt>11390</CashDeemedCharitableAmt>
        <NetVlNoncharitableAssetsAmt>747961</NetVlNoncharitableAssetsAmt>
        <MinimumInvestmentReturnAmt>37398</MinimumInvestmentReturnAmt>
      </MinimumInvestmentReturnGrp>
      <DistributableAmountGrp>
        <MinimumInvestmentReturnAmt>37398</MinimumInvestmentReturnAmt>
        <DistributableBeforeAdjAmt>37398</DistributableBeforeAdjAmt>
        <DistributableBeforeDedAmt>37398</DistributableBeforeDedAmt>
        <DistributableAsAdjustedAmt>37398</DistributableAsAdjustedAmt>
      </DistributableAmountGrp>
      <QualifyingDistriPartXIIGrp>
        <ExpensesAndContributionsAmt>40000</ExpensesAndContributionsAmt>
        <QualifyingDistributionsAmt>40000</QualifyingDistributionsAmt>
        <AdjustedQualifyingDistriAmt>40000</AdjustedQualifyingDistriAmt>
      </QualifyingDistriPartXIIGrp>
      <UndistributedIncomeGrp>
        <DistributableAsAdjustedAmt>37398</DistributableAsAdjustedAmt>
        <ExcessDistributionCyovYr5Amt>316</ExcessDistributionCyovYr5Amt>
        <ExcessDistributionCyovYr4Amt>189229</ExcessDistributionCyovYr4Amt>
        <ExcessDistributionCyovYr3Amt>32931</ExcessDistributionCyovYr3Amt>
        <ExcessDistributionCyovYr2Amt>48261</ExcessDistributionCyovYr2Amt>
        <ExcessDistributionCyovYr1Amt>105453</ExcessDistributionCyovYr1Amt>
        <TotalExcessDistributionCyovAmt>376190</TotalExcessDistributionCyovAmt>
        <QualifyingDistributionsAmt>40000</QualifyingDistributionsAmt>
        <AppliedToCurrentYearAmt>37398</AppliedToCurrentYearAmt>
        <RemainingDistriFromCorpusAmt>2602</RemainingDistriFromCorpusAmt>
        <TotalCorpusAmt>378792</TotalCorpusAmt>
        <UndistributedIncomeCYAmt>0</UndistributedIncomeCYAmt>
        <ExcessDistriCyovFromYr5Amt>316</ExcessDistriCyovFromYr5Amt>
        <ExcessDistriCyovToNextYrAmt>378476</ExcessDistriCyovToNextYrAmt>
        <ExcessFromYear4Amt>189229</ExcessFromYear4Amt>
        <ExcessFromYear3Amt>32931</ExcessFromYear3Amt>
        <ExcessFromYear2Amt>48261</ExcessFromYear2Amt>
        <ExcessFromYear1Amt>105453</ExcessFromYear1Amt>
        <ExcessFromCurrentYearAmt>2602</ExcessFromCurrentYearAmt>
      </UndistributedIncomeGrp>
      <SupplementaryInformationGrp>
        <OnlyContriToPreselectedInd>X</OnlyContriToPreselectedInd>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>HOUSTON METHODIST HOSPITAL FNDTN</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>1707 SUNSET BLVD</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>77005</ZIPCd>
          </RecipientUSAddress>
          <RecipientRelationshipTxt>NONE</RecipientRelationshipTxt>
          <RecipientFoundationStatusTxt>PC</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>GENERAL CONTRIBUTION</GrantOrContributionPurposeTxt>
          <Amt>20000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>DUCHESNE ACADEMY OF THE SACRED HEAR</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>10202 MEMORIAL DRIVE</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>77024</ZIPCd>
          </RecipientUSAddress>
          <RecipientFoundationStatusTxt>PC</RecipientFoundationStatusTxt>
          <GrantOrContributionPurposeTxt>THE DUCHESNE FUND</GrantOrContributionPurposeTxt>
          <Amt>5000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>BAYLOR COLLEGE OF MEDICINE-DAN DUNC</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>1 BAYLOR PLAZA</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>77030</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL CONTRIBUTION</GrantOrContributionPurposeTxt>
          <Amt>10000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <GrantOrContributionPdDurYrGrp>
          <RecipientBusinessName>
            <BusinessNameLine1Txt>ST PIUS X HIGH SCHOOL</BusinessNameLine1Txt>
          </RecipientBusinessName>
          <RecipientUSAddress>
            <AddressLine1Txt>811 W DONOVAN ST</AddressLine1Txt>
            <CityNm>HOUSTON</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>77091</ZIPCd>
          </RecipientUSAddress>
          <GrantOrContributionPurposeTxt>GENERAL CONTRIBUTION</GrantOrContributionPurposeTxt>
          <Amt>5000</Amt>
        </GrantOrContributionPdDurYrGrp>
        <TotalGrantOrContriPdDurYrAmt>40000</TotalGrantOrContriPdDurYrAmt>
      </SupplementaryInformationGrp>
      <TrnsfrTransRlnNonchrtblEOGrp>
        <TrnsfrOfCashToNonchrtblEOInd>false</TrnsfrOfCashToNonchrtblEOInd>
        <TrnsfrOtherAssetNonchrtblEOInd>false</TrnsfrOtherAssetNonchrtblEOInd>
        <SalesOrExchangesOfAssetsInd>false</SalesOrExchangesOfAssetsInd>
        <PurchaseOfAssetsNonchrtblEOInd>false</PurchaseOfAssetsNonchrtblEOInd>
        <RentalOfFacilitiesOthAssetsInd>false</RentalOfFacilitiesOthAssetsInd>
        <ReimbursementArrangementsInd>false</ReimbursementArrangementsInd>
        <LoansOrLoanGuaranteesInd>false</LoansOrLoanGuaranteesInd>
        <PerformanceOfServicesEtcInd>false</PerformanceOfServicesEtcInd>
        <SharingOfFacilitiesEtcInd>false</SharingOfFacilitiesEtcInd>
        <RelationshipsNonchrtblEOInd>false</RelationshipsNonchrtblEOInd>
      </TrnsfrTransRlnNonchrtblEOGrp>
    </IRS990PF>
    <OtherIncreasesSchedule documentId="RetDoc1">
      <OtherIncreasesDetail>
        <Desc>ADJ TO PRIOR YEAR DONATIONS-VOIDED CHECK</Desc>
        <Amt>10000</Amt>
      </OtherIncreasesDetail>
    </OtherIncreasesSchedule>
  </ReturnData>
</Return>
