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        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>SARAH MCGILL</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>STEPHEN KRANZ</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DAVID NICHOLSON</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TOM ROESSER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAMELA OLSON</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DENNIS GROTH</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOSEPH HENCHMAN</PersonNm>
        <TitleTxt>EXECUTIVE VICE PRESIDENT</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>194724</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>15520</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL VOGLER VICE PRESIDENT</PersonNm>
        <TitleTxt>OF CORPORATE GIVING</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>157775</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>6120</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>NICOLE KAEDING</PersonNm>
        <TitleTxt>DIR. OF FEDERAL PROJECTS</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>111810</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>17140</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>KYLE POMERLEAU DIR OF</PersonNm>
        <TitleTxt>CENTER FOR QUANTITATIVE ANALYSIS</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>111921</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>8300</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DAVE MESSICS VICE PRESIDENT OF</PersonNm>
        <TitleTxt>INDIVIDUAL &amp; FOUNDATION GIVING</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>121716</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>3763</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>979529</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>58993</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>8</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>V STUDIOS</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>8229 BOONE BLVD SUITE 420</AddressLine1Txt>
            <CityNm>VIENNA</CityNm>
            <StateAbbreviationCd>VA</StateAbbreviationCd>
            <ZIPCd>22182</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>COMPUTER PROGRAMMING SUPPORT</ServicesDesc>
        <CompensationAmt>150153</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
      <FundraisingAmt>737274</FundraisingAmt>
      <AllOtherContributionsAmt>4690077</AllOtherContributionsAmt>
      <NoncashContributionsAmt>52884</NoncashContributionsAmt>
      <TotalContributionsAmt>5427351</TotalContributionsAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>63256</TotalRevenueColumnAmt>
        <ExclusionAmt>63256</ExclusionAmt>
      </InvestmentIncomeGrp>
      <FundraisingGrossIncomeAmt>131236</FundraisingGrossIncomeAmt>
      <ContriRptFundraisingEventAmt>737274</ContriRptFundraisingEventAmt>
      <FundraisingDirectExpensesAmt>336090</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>-204854</TotalRevenueColumnAmt>
        <ExclusionAmt>-204854</ExclusionAmt>
      </NetIncmFromFundraisingEvtGrp>
      <OtherRevenueMiscGrp>
        <Desc>HONORARIA &amp; REIMBURSEMENTS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>29068</TotalRevenueColumnAmt>
        <ExclusionAmt>29068</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>29068</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>5314821</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>-112530</ExclusionAmt>
      </TotalRevenueGrp>
      <ForeignGrantsGrp>
        <TotalAmt>35439</TotalAmt>
        <ProgramServicesAmt>35439</ProgramServicesAmt>
      </ForeignGrantsGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>293150</TotalAmt>
        <ProgramServicesAmt>202495</ProgramServicesAmt>
        <ManagementAndGeneralAmt>43768</ManagementAndGeneralAmt>
        <FundraisingAmt>46887</FundraisingAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>2434549</TotalAmt>
        <ProgramServicesAmt>1683126</ProgramServicesAmt>
        <ManagementAndGeneralAmt>362043</ManagementAndGeneralAmt>
        <FundraisingAmt>389380</FundraisingAmt>
      </OtherSalariesAndWagesGrp>
      <PensionPlanContributionsGrp>
        <TotalAmt>60170</TotalAmt>
        <ProgramServicesAmt>40314</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10229</ManagementAndGeneralAmt>
        <FundraisingAmt>9627</FundraisingAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>174312</TotalAmt>
        <ProgramServicesAmt>116788</ProgramServicesAmt>
        <ManagementAndGeneralAmt>29634</ManagementAndGeneralAmt>
        <FundraisingAmt>27890</FundraisingAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>191851</TotalAmt>
        <ProgramServicesAmt>128540</ProgramServicesAmt>
        <ManagementAndGeneralAmt>32615</ManagementAndGeneralAmt>
        <FundraisingAmt>30696</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>465</TotalAmt>
        <ProgramServicesAmt>465</ProgramServicesAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>15537</TotalAmt>
        <ManagementAndGeneralAmt>15537</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>123906</TotalAmt>
        <FundraisingAmt>123906</FundraisingAmt>
      </FeesForServicesProfFundraising>
      <FeesForServicesOtherGrp>
        <TotalAmt>328157</TotalAmt>
        <ProgramServicesAmt>328157</ProgramServicesAmt>
      </FeesForServicesOtherGrp>
      <AdvertisingGrp>
        <TotalAmt>32149</TotalAmt>
        <ProgramServicesAmt>27258</ProgramServicesAmt>
        <ManagementAndGeneralAmt>98</ManagementAndGeneralAmt>
        <FundraisingAmt>4793</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>388680</TotalAmt>
        <ProgramServicesAmt>77876</ProgramServicesAmt>
        <ManagementAndGeneralAmt>38192</ManagementAndGeneralAmt>
        <FundraisingAmt>272612</FundraisingAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>30574</TotalAmt>
        <ProgramServicesAmt>22765</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3319</ManagementAndGeneralAmt>
        <FundraisingAmt>4490</FundraisingAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>361964</TotalAmt>
        <ProgramServicesAmt>242516</ProgramServicesAmt>
        <ManagementAndGeneralAmt>61534</ManagementAndGeneralAmt>
        <FundraisingAmt>57914</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>202519</TotalAmt>
        <ProgramServicesAmt>168928</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1414</ManagementAndGeneralAmt>
        <FundraisingAmt>32177</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>82231</TotalAmt>
        <ProgramServicesAmt>76582</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5649</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>122423</TotalAmt>
        <ProgramServicesAmt>82023</ProgramServicesAmt>
        <ManagementAndGeneralAmt>20812</ManagementAndGeneralAmt>
        <FundraisingAmt>19588</FundraisingAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>25771</TotalAmt>
        <ProgramServicesAmt>17267</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4381</ManagementAndGeneralAmt>
        <FundraisingAmt>4123</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>DUES &amp; SUBSCRIPTIONS</Desc>
        <TotalAmt>123619</TotalAmt>
        <ProgramServicesAmt>106404</ProgramServicesAmt>
        <FundraisingAmt>17215</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>STAFF DEVELOPMENT</Desc>
        <TotalAmt>35236</TotalAmt>
        <ProgramServicesAmt>24442</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4931</ManagementAndGeneralAmt>
        <FundraisingAmt>5863</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>MISCELLANEOUS</Desc>
        <TotalAmt>23161</TotalAmt>
        <ProgramServicesAmt>18423</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4674</ManagementAndGeneralAmt>
        <FundraisingAmt>64</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>BAD DEBT</Desc>
        <TotalAmt>14776</TotalAmt>
        <ManagementAndGeneralAmt>14776</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>5100639</TotalAmt>
        <ProgramServicesAmt>3399808</ProgramServicesAmt>
        <ManagementAndGeneralAmt>653606</ManagementAndGeneralAmt>
        <FundraisingAmt>1047225</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>9477</BOYAmt>
        <EOYAmt>323277</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>605854</BOYAmt>
        <EOYAmt>298302</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>141358</BOYAmt>
        <EOYAmt>304871</EOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>91289</BOYAmt>
        <EOYAmt>79449</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>1151056</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>535336</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>674127</BOYAmt>
        <EOYAmt>615720</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>2767422</BOYAmt>
        <EOYAmt>2553988</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>73018</BOYAmt>
        <EOYAmt>76008</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>4362545</BOYAmt>
        <EOYAmt>4251615</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>177945</BOYAmt>
        <EOYAmt>156369</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>945035</BOYAmt>
        <EOYAmt>932924</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>1122980</BOYAmt>
        <EOYAmt>1089293</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
      <UnrestrictedNetAssetsGrp>
        <BOYAmt>2930147</BOYAmt>
        <EOYAmt>2963313</EOYAmt>
      </UnrestrictedNetAssetsGrp>
      <PermanentlyRstrNetAssetsGrp>
        <BOYAmt>309418</BOYAmt>
        <EOYAmt>199009</EOYAmt>
      </PermanentlyRstrNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>3239565</BOYAmt>
        <EOYAmt>3162322</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>4362545</BOYAmt>
        <EOYAmt>4251615</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>214182</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-291425</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>3839683</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3577743</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4274002</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5115594</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5222497</CurrentTaxYearAmt>
        <TotalAmt>22029519</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>3839683</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>3577743</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4274002</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5115594</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5222497</CurrentTaxYearAmt>
        <TotalAmt>22029519</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>4499672</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>17529847</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>32342</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>138044</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>97294</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>56570</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>63256</CurrentTaxYearAmt>
        <TotalAmt>387506</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>12864</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>10082</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>56245</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>19128</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>29068</CurrentTaxYearAmt>
        <TotalAmt>127387</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>22544412</TotalSupportAmt>
      <PublicSupportCY170Pct>0.77760</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.76290</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER INCOME - 2014 AMOUNT: $ 12,864. 2015 AMOUNT: $ 10,082. 2016 AMOUNT: $ 56,245. 2017 AMOUNT: $ 4,112. REIMBURSEMENTS - 2017 AMOUNT: $ 15,016. 2018 AMOUNT: $ 29,068.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <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="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>645581</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>216987</DepreciationAmt>
        <BookValueAmt>428594</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>505475</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>318349</DepreciationAmt>
        <BookValueAmt>187126</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>615720</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED RENT &amp; LEASE INCENTIVE</Desc>
        <Amt>919229</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>CAPITAL LEASE LIABILITY</Desc>
        <Amt>13695</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>932924</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>5023396</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>-291425</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>-291425</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>5314821</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>5314821</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5100639</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>5100639</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>5100639</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDATION BELIEVES THAT IT HAS APPROPRIATE SUPPORT FOR ANY TAX POSITIONS TAKEN, AND AS SUCH, DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS THAT ARE MATERIAL TO THE FINANCIAL STATEMENTS OR THAT WOULD HAVE AN EFFECT ON ITS TAX-EXEMPT STATUS. THERE ARE NO UNRECOGNIZED TAX BENEFITS OR LIABILITIES THAT NEED TO BE RECORDED.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PRESIDENT OF THE GRANTEE REPORTS PERIODICALLY ON THE STUDY'S PROGRESS. THE TAX FOUNDATION'S PRESIDENT TRAVELS TO MADRID TO TAKE PART IN THE RELEASE OF THE STUDY.</ExplanationTxt>
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          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20008</ZIPCd>
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      <FundraiserActivityInfoGrp>
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          <AddressLine1Txt>300 N WASHINGTON ST STE 950</AddressLine1Txt>
          <CityNm>ALEXANDRIA</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
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        <FundraiserControlOfFundsInd>0</FundraiserControlOfFundsInd>
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        <RetainedByContractorAmt>53239</RetainedByContractorAmt>
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      <TotalGrossReceiptsAmt>562230</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>123906</TotalRetainedByContractorsAmt>
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      <LicensedStatesCd>AL</LicensedStatesCd>
      <LicensedStatesCd>AK</LicensedStatesCd>
      <LicensedStatesCd>AR</LicensedStatesCd>
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      <LicensedStatesCd>CO</LicensedStatesCd>
      <LicensedStatesCd>CT</LicensedStatesCd>
      <LicensedStatesCd>DC</LicensedStatesCd>
      <LicensedStatesCd>FL</LicensedStatesCd>
      <LicensedStatesCd>GA</LicensedStatesCd>
      <LicensedStatesCd>HI</LicensedStatesCd>
      <LicensedStatesCd>IL</LicensedStatesCd>
      <LicensedStatesCd>KS</LicensedStatesCd>
      <LicensedStatesCd>KY</LicensedStatesCd>
      <LicensedStatesCd>ME</LicensedStatesCd>
      <LicensedStatesCd>MD</LicensedStatesCd>
      <LicensedStatesCd>MA</LicensedStatesCd>
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      <LicensedStatesCd>MN</LicensedStatesCd>
      <LicensedStatesCd>MS</LicensedStatesCd>
      <LicensedStatesCd>NV</LicensedStatesCd>
      <LicensedStatesCd>NH</LicensedStatesCd>
      <LicensedStatesCd>NJ</LicensedStatesCd>
      <LicensedStatesCd>NM</LicensedStatesCd>
      <LicensedStatesCd>NY</LicensedStatesCd>
      <LicensedStatesCd>NC</LicensedStatesCd>
      <LicensedStatesCd>ND</LicensedStatesCd>
      <LicensedStatesCd>OH</LicensedStatesCd>
      <LicensedStatesCd>OK</LicensedStatesCd>
      <LicensedStatesCd>OR</LicensedStatesCd>
      <LicensedStatesCd>PA</LicensedStatesCd>
      <LicensedStatesCd>RI</LicensedStatesCd>
      <LicensedStatesCd>SC</LicensedStatesCd>
      <LicensedStatesCd>TN</LicensedStatesCd>
      <LicensedStatesCd>UT</LicensedStatesCd>
      <LicensedStatesCd>VA</LicensedStatesCd>
      <LicensedStatesCd>WA</LicensedStatesCd>
      <LicensedStatesCd>WV</LicensedStatesCd>
      <LicensedStatesCd>WI</LicensedStatesCd>
      <FundraisingEventInformationGrp>
        <Event1Nm>ANNUAL DINNER</Event1Nm>
        <GrossReceiptsEvent1Amt>868510</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>737274</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>131236</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>27000</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>120300</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>188790</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>868510</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>737274</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>131236</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>27000</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>120300</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>188790</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>336090</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-204854</NetIncomeSummaryAmt>
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      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
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      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>289733</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOSEPH HENCHMAN</PersonNm>
        <TitleTxt>EXECUTIVE VICE PRESIDENT</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL VOGLER VICE PRESIDENT</PersonNm>
        <TitleTxt>OF CORPORATE GIVING</TitleTxt>
        <BaseCompensationFilingOrgAmt>147775</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>10000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>6120</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>163895</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TAX FOUNDATION PARTICIPATES IN THE ANNUAL THINK TANK COMPENSATION STUDY WHICH COLLECTS COMPENSATION AND BENEFITS DATA RELEVANT TO THINK TANKS AND OTHER RESEARCH ORGANIZATIONS IN THE UNITED STATES THAT CONDUCT RESEARCH IN THE PUBLIC POLICY, FOREIGN POLICY, AND INTERNATIONAL RELATIONS ARENAS. THE BOARD OF DIRECTORS UTILIZES ITS EXPERIENCE AND EXPERTISE IN CONJUNCTION WITH THE STUDY RESULTS IN DETERMINING THE APPROPRIATE SALARY LEVEL ANNUALLY. THE CHAIRPERSON OF THE BOARD OF DIRECTORS COMMUNICATES IN WRITING THE SALARY APPROVED BY THE BOARD TO THE APPROPRIATE ACCOUNTING PERSONNEL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TAX FOUNDATION AWARDED PERFORMANCE BASED BONUSES TO SEVERAL EMPLOYEES, INCLUDING ALL OF THE HIGHEST COMPENSATED EMPLOYEES LISTED ON FORM 990, PART VII. THESE BONUSES ARE INCLUDED IN THE AMOUNTS REPORTED ON FORM 990, PART VII, SECTION A, COLUMN D - REPORTABLE COMPENSATION. THE PRESIDENT DECLINED A BONUS FOR 2018.</ExplanationTxt>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>4</ContributionCnt>
        <NoncashContributionsRptF990Amt>43502</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesCloselyHeldStockGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>WINE FOR ANNUAL EVENT</Desc>
        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>9382</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>0</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>TAX FOUNDATION REPORTS THE NUMBER OF CONTRIBUTIONS.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FEDERAL FORM 990 IS REVIEWED BY THE ACCOUNTING PERSONNEL AND THE PRESIDENT OF THE TAX FOUNDATION BEFORE BEING SIGNED BY THE PRESIDENT. A COPY OF THE 990 IS PROVIDED TO ALL MEMBERS OF THE BOARD OF DIRECTORS ELECTRONICALLY PRIOR TO BEING FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>AS A GENERAL POLICY MATTER THE TAX FOUNDATION DOES NOT PERMIT MEMBERS OF THE BOARD OF DIRECTORS TO ENTER INTO FINANCIAL ARRANGEMENTS, PROVIDE SERVICES, OR OTHERWISE BE COMPENSATED IN ANY MANNER, INCLUDING ANY COMPANY WITH WHICH SUCH BOARD MEMBER MAY BE ASSOCIATED. BIANNUALLY, ALL OFFICERS AND MEMBERS OF THE BOARD OF DIRECTORS MUST REVIEW AND SIGN A CONFLICT OF INTEREST POLICY STATEMENT. THE MONITORING OF COMPLIANCE IS HANDLED INFORMALLY AT REGULARLY SCHEDULED BOARD MEETINGS. FOR EMPLOYEES, THE CONFLICT OF INTEREST POLICY IS CONTAINED WITHIN THEIR EMPLOYEE MANUAL. THEY SIGN THE MANUAL WHEN THEY ARE HIRED OR WHEN CHANGES ARE MADE TO THE MANUAL (THERE WERE NO CHANGES IN 2018).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TAX FOUNDATION PARTICIPATES IN THE ANNUAL THINK TANK COMPENSATION STUDY WHICH COLLECTS COMPENSATION AND BENEFITS DATA RELEVANT TO THINK TANKS AND OTHER RESEARCH ORGANIZATIONS IN THE U.S. THAT CONDUCT RESEARCH IN THE PUBLIC POLICY, FOREIGN POLICY, AND INTERNATIONAL RELATIONS ARENAS. THE BOARD OF DIRECTORS UTILIZES ITS EXPERIENCE AND EXPERTISE IN CONJUNCTION WITH THE STUDY TO DETERMINE THE APPROPRIATE SALARY LEVEL FOR THE PRESIDENT AND ALL STAFF MEMBERS. THE ORGANIZATION CURRENTLY HAS NO OTHER PAID OFFICERS OR STAFF MEMBERS CLASSIFIED AS "KEY EMPLOYEES" AS DEFINED BY THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PROVIDES GOVERNING DOCUMENTS, THE FEDERAL FORM 990 AND APPLICATION FOR EXEMPTION (FEDERAL FORM 1023) TO INTERESTED PARTIES UPON REQUEST. COPIES OF THE AUDITED FINANCIAL STATEMENTS AND FORM 990 ARE AVAILABLE ON THE WEBSITE. WE HAVE NOT BEEN ASKED TO AND CURRENTLY DO NOT HAVE A POLICY OF PROVIDING A COPY OF THE CONFLICT OF INTEREST POLICY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS NOT CHANGED ITS OVERSIGHT PROCESS OR SELECTION OF AN INDEPENDENT AUDITOR PROCESS DURING THE YEAR.</ExplanationTxt>
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  </ReturnData>
</Return>