Liabilities / Assets
33rd percentile
Tied with the lowest-debt nonprofits in its peer group.
EIN 36-3495031 • 501(c)3 • Washington, IL
Profile
The mission of the washington historical society is to acquire, preserve, and display washington history. While maintaining a museum is a partial focus, washington historical society maintains a library with significant records, allowing genealogy research as well as educational programs such as time travels in trucks and trunks to the local school districts. Washington historical society also provides free presentations and programs to the general public for historical interest and educational opportunities throughout the year.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
33rd percentile
Tied with the lowest-debt nonprofits in its peer group.
Liabilities / Revenue
34th percentile
Tied with the lowest-debt nonprofits in its peer group.
Net Margin
82nd percentile
Higher net margin than 82% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
54th percentile
Faster asset growth than 54% of similar nonprofits.
Revenue Growth
42nd percentile
Faster revenue growth than 42% of similar nonprofits.
Assets
Up$927,339
Up $48,778 (+5.6%) from 2024
Liabilities
Flat$0
Flat from 2024
Net Assets
Up$927,339
Up $48,778 (+5.6%) from 2024
Revenue
Up$151,828
Up $61,986 (+69%) from 2024
Expenses
Up$103,050
Up $49,498 (+92%) from 2024
Net Income
Up$48,778
Up $12,488 (+34%) from 2024
Most recent year
2025 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
The mission of the washington historical society is to acquire, preserve, and display washington history. While maintaining a museum is a partial focus, washington historical society maintains a library with significant records, allowing genealogy research as well as educational programs such as time travels in trucks and trunks to the local school districts. Washington historical society also provides free presentations and programs to the general public for historical interest and educational opportunities throughout the year.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $616,639 | $599,619 | ▼ $17,020 |
| Investments in Publicly Traded Securities | $195,431 | $201,642 | ▲ $6,211 |
| Cash and Non-Interest-Bearing Accounts | $62,339 | $124,170 | ▲ $61,831 |
| Savings and Temporary Cash Investments | $4,152 | $1,908 | ▼ $2,244 |
| Total Assets | $878,561 | $927,339 | ▲ $48,778 |
| Liabilities | |||
| Total Liabilities | $0 | $0 | → $0 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $878,561 | $927,339 | ▲ $48,778 |
| Total Net Assets Fund Balance | $878,561 | $927,339 | ▲ $48,778 |
| Total Liabilities and Net Assets / Fund Balance | $878,561 | $927,339 | ▲ $48,778 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $371,921 | $46,994 | $418,915 |
| Other Land Buildings | $227,698 | $17,165 | $244,863 |
| Name | Title |
|---|---|
| Jennifer Essig | President |
| Jean Montgomery | Trustee |
| Jewel Ward | Trustee |
| John Stromberger | Trustee |
| Judy Gross | Trustee |
| Kit Zinser | Trustee |
| Mike Mccoskey | Trustee |
| Sue Freeberg | Secretary |
| Brice Hahn | Treasurer |
| Patty Wagner | Vice Preside |
| Line Item | Amount |
|---|---|
| Other Expenses | $103,050 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Salaries, Compensation, and Employee Benefits | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Advertising | $24,956 | - | - | $24,956 |
| Depreciation Depletion | $17,020 | - | - | $17,020 |
| Fees for Services Management | $8,422 | $6,300 | - | $14,722 |
| Office Expenses | $2,957 | $3,985 | - | $6,942 |
| Insurance | $3,953 | - | - | $3,953 |
| Occupancy | $3,766 | - | - | $3,766 |
| Fees for Services Accounting | - | $1,790 | - | $1,790 |
| Fees for Service Investment Mgmnt Fees | - | $1,735 | - | $1,735 |
| Information Technology | - | $1,429 | - | $1,429 |
| Other Expenses | $95 | $95 | - | $190 |
| Total Functional Expenses | $87,716 | $15,334 | $0 | $103,050 |
| Line Item | Amount |
|---|---|
| Fundraising Gross Income | $39,089 |
| Fundraising Direct Expenses | $21,138 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| Christmas House | $9,025 | $9,025 | $546 | $8,479 |
| Bicentennial Fu | $7,517 | $7,517 | $9,015 | $-1,498 |
| Total Events | $30,249 | $30,249 | $20,175 | $10,074 |
“Treasurer and president will review prior to being filed.”
“The organization provides copies of the 990 to anyone who provides a request.”
“The mission of the washington historical society is to acquire, preserve, and display washington history. While maintaining a museum is a partial focus, washington historical society maintains a library with significant records, allowing genealogy research as well as educational programs such as time travels in trucks and trunks to the local school districts. Washington historical society also provides free presentations and programs to the general public for historical interest and educational opportunities throughout the year.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | THE MISSION OF THE WASHINGTON HISTORICAL SOCIETY IS TO ACQUIRE, PRESERVE, AND DISPLAY WASHINGTON HISTORY. WHILE MAINTAINING A MUSEUM IS A PARTIAL FOCUS, WASHINGTON HISTORICAL SOCIETY MAINTAINS A LIBRARY WITH SIGNIFICANT RECORDS, ALLOWING GENEALOGY RESEARCH AS WELL AS EDUCATIONAL PROGRAMS SUCH AS TIME TRAVELS IN TRUCKS AND TRUNKS TO THE LOCAL SCHOOL DISTRICTS. WASHINGTON HISTORICAL SOCIETY ALSO PROVIDES FREE PRESENTATIONS AND PROGRAMS TO THE GENERAL PUBLIC FOR HISTORICAL INTEREST AND EDUCATIONAL OPPORTUNITIES THROUGHOUT THE YEAR. |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 24956 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 24956 |
| IRS990/AllOtherContributionsAmt | 0 | 106766 |
| IRS990/BackupWthldComplianceInd | 0 | false |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | MELISSA HEIL |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 7734250499 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 1305 BUTTERNUT COURT |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | GERMANTOWN HILLS |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 61548 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 62339 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 124170 |
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| IRS990/CYOtherExpensesAmt | 0 | 103050 |
| IRS990/CYOtherRevenueAmt | 0 | 2669 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 48778 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 103050 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 151828 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
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| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 17020 |
| IRS990/Desc | 0 | THE MAIN FOCUS OF THE WASHINGTON HISTORICAL SOCIETY IS TO PROVIDE A MUSEUM AND LIBRARY OF WASHINGTON HISTORY. THIS INCLUDES EXPENSES FOR EDUCATIONAL PROGRAMS AND MAINTENANCE OF THE MUSEUM AND LIBRARY. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
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| IRS990/ElectionOfBoardMembersInd | 0 | false |
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| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 14722 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/ManagementAndGeneralAmt | 0 | 1735 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 1735 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 2.00 |
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| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
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| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | JUDY GROSS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | BRICE HAHN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | MIKE MCCOSKEY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JEAN MONTGOMERY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JOHN STROMBERGER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | PATTY WAGNER |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | KIT ZINSER |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | VICE PRESIDE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | TRUSTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | false |
| IRS990/FormationYr | 0 | 1981 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedInd | 0 | false |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingDirectExpensesAmt | 0 | 21138 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 39089 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -327 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 10 |
| IRS990/GovernmentGrantsAmt | 0 | 27722 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 38976 |
| IRS990/GrossReceiptsAmt | 0 | 229942 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 1855 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 10 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 1429 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 1429 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 3953 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 3953 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 6618 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 6618 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 195431 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 201642 |
| IRS990/IRPDocumentCnt | 0 | 1 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 64159 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 616639 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 599619 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 663778 |
| IRS990/LegalDomicileStateCd | 0 | IL |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 39303 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 17673 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembershipDuesAmt | 0 | 8380 |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingCashInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | THE MISSION OF THE WASHINGTON HISTORICAL SOCIETY IS TO ACQUIRE, PRESERVE, AND DISPLAY WASHINGTON HISTORY. WHILE MAINTAINING A MUSEUM IS A PARTIAL FOCUS, WASHINGTON HISTORICAL SOCIETY MAINTAINS A LIBRARY WITH SIGNIFICANT RECORDS, ALLOWING GENEALOGY RESEARCH AS WELL AS EDUCATIONAL PROGRAMS SUCH AS TIME TRAVELS IN TRUCKS AND TRUNKS TO THE LOCAL SCHOOL DISTRICTS. WASHINGTON HISTORICAL SOCIETY ALSO PROVIDES FREE PRESENTATIONS AND PROGRAMS TO THE GENERAL PUBLIC FOR HISTORICAL INTEREST AND EDUCATIONAL OPPORTUNITIES THROUGHOUT THE YEAR. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 878561 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 927339 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | -327 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -327 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 17951 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 17951 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | -15818 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | -15818 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 878561 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 927339 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 3766 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 3766 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 3985 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 2957 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 6942 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherExpensesGrp/Desc | 0 | COMMUNITY OUTREACH |
| IRS990/OtherExpensesGrp/Desc | 1 | BUILDING PROJECT |
| IRS990/OtherExpensesGrp/Desc | 2 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 95 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 22993 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 3554 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 95 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 22993 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 3554 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 190 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 536 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 536 |
| IRS990/OtherRevenueTotalAmt | 0 | 536 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfficerNm | 0 | JENNIFER ESSIG |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 26706 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 26499 |
| IRS990/PYOtherExpensesAmt | 0 | 53552 |
| IRS990/PYOtherRevenueAmt | 0 | 36637 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 36290 |
| IRS990/PYTotalExpensesAmt | 0 | 53552 |
| IRS990/PYTotalRevenueAmt | 0 | 89842 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 48778 |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | -15818 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 4152 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 1908 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearAmt | 0 | 142868 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus1YearAmt | 0 | 26706 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 113489 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 156214 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 104036 |
| IRS990ScheduleA/GiftsGrantsContrisRcvd509Grp/TotalAmt | 0 | 543313 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearAmt | 0 | 8473 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus1YearAmt | 0 | 19102 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 22907 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 17697 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 7780 |
| IRS990ScheduleA/GrossInvestmentIncome509Grp/TotalAmt | 0 | 75959 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/CurrentTaxYearMinus4YearsAmt | 0 | 3722 |
| IRS990ScheduleA/GrossReceiptsAdmissionsGrp/TotalAmt | 0 | 3722 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearAmt | 0 | 8473 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus1YearAmt | 0 | 19102 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 22907 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 17697 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/CurrentTaxYearMinus4YearsAmt | 0 | 7780 |
| IRS990ScheduleA/InvestmentIncomeAndUBTIGrp/TotalAmt | 0 | 75959 |
| IRS990ScheduleA/InvestmentIncomeCYPct | 0 | 0.11000 |
| IRS990ScheduleA/InvestmentIncomePYPct | 0 | 0.10000 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearAmt | 0 | 17487 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus1YearAmt | 0 | 27954 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus2YearsAmt | 0 | 11204 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/CurrentTaxYearMinus3YearsAmt | 0 | 2674 |
| IRS990ScheduleA/NetIncomeFromOtherUBIGrp/TotalAmt | 0 | 59319 |
| IRS990ScheduleA/PubliclySupportedOrg509a2Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY509Pct | 0 | 0.80170 |
| IRS990ScheduleA/PublicSupportPY509Pct | 0 | 0.84390 |
| IRS990ScheduleA/PublicSupportTotal509Amt | 0 | 547035 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY509Ind | 0 | X |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearAmt | 0 | 142868 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus1YearAmt | 0 | 26706 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus2YearsAmt | 0 | 113489 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus3YearsAmt | 0 | 156214 |
| IRS990ScheduleA/Total509Grp/CurrentTaxYearMinus4YearsAmt | 0 | 107758 |
| IRS990ScheduleA/Total509Grp/TotalAmt | 0 | 547035 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearAmt | 0 | 168828 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus1YearAmt | 0 | 73762 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus2YearsAmt | 0 | 147600 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus3YearsAmt | 0 | 176585 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/CurrentTaxYearMinus4YearsAmt | 0 | 115538 |
| IRS990ScheduleA/TotalSupportCalendarYearGrp/TotalAmt | 0 | 682313 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | true |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 371921 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 46994 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 418915 |
| IRS990ScheduleD/OtherLandBuildingsGrp/BookValueAmt | 0 | 227698 |
| IRS990ScheduleD/OtherLandBuildingsGrp/DepreciationAmt | 0 | 17165 |
| IRS990ScheduleD/OtherLandBuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 244863 |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 599619 |
| IRS990ScheduleG/FundraisingEventInformationGrp/DirectExpenseSummaryEventsAmt | 0 | 20175 |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event1Nm | 0 | CHRISTMAS HOUSE |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event2Nm | 0 | BICENTENNIAL FU |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsEvent1Amt | 0 | 9025 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsEvent2Amt | 0 | 7517 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsOtherEventsAmt | 0 | 13707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsTotalAmt | 0 | 30249 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueEvent1Amt | 0 | 9025 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueEvent2Amt | 0 | 7517 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueOtherEventsAmt | 0 | 13707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueTotalEventsAmt | 0 | 30249 |
| IRS990ScheduleG/FundraisingEventInformationGrp/NetIncomeSummaryAmt | 0 | 10074 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OthDirectExpnssOtherEventsAmt | 0 | 10614 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OthDirectExpnssTotalEventsAmt | 0 | 20175 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OtherDirectExpensesEvent1Amt | 0 | 546 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OtherDirectExpensesEvent2Amt | 0 | 9015 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OtherEventsTotalCnt | 0 | 2 |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | THE MISSION OF THE WASHINGTON HISTORICAL SOCIETY IS TO ACQUIRE, PRESERVE, AND DISPLAY WASHINGTON HISTORY. WHILE MAINTAINING A MUSEUM IS A PARTIAL FOCUS, WASHINGTON HISTORICAL SOCIETY MAINTAINS A LIBRARY WITH SIGNIFICANT RECORDS, ALLOWING GENEALOGY RESEARCH AS WELL AS EDUCATIONAL PROGRAMS SUCH AS TIME TRAVELS IN TRUCKS AND TRUNKS TO THE LOCAL SCHOOL DISTRICTS. WASHINGTON HISTORICAL SOCIETY ALSO PROVIDES FREE PRESENTATIONS AND PROGRAMS TO THE GENERAL PUBLIC FOR HISTORICAL INTEREST AND EDUCATIONAL OPPORTUNITIES THROUGHOUT THE YEAR. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | TREASURER AND PRESIDENT WILL REVIEW PRIOR TO BEING FILED. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | THE ORGANIZATION PROVIDES COPIES OF THE 990 TO ANYONE WHO PROVIDES A REQUEST. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | FORM 990 - ORGANIZATION'S MISSION |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | FORM 990, PAGE 6, PART VI, LINE 11B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | FORM 990, PAGE 6, PART VI, LINE 19 |
| IRS990/SchoolOperatingInd | 0 | false |
| IRS990/SignificantChangeInd | 0 | false |
| IRS990/SignificantNewProgramSrvcInd | 0 | false |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | IL |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | false |
| IRS990/SubjectToProxyTaxInd | 0 | false |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
| IRS990/TotalAssetsBOYAmt | 0 | 878561 |
| IRS990/TotalAssetsEOYAmt | 0 | 927339 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 878561 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 927339 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalContributionsAmt | 0 | 142868 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 15334 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 87716 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 103050 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 878561 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 927339 |
| IRS990/TotalProgramServiceExpensesAmt | 0 | 87716 |
| IRS990/TotalRevenueGrp/ExclusionAmt | 0 | 8960 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 151828 |
| IRS990/TotalVolunteersCnt | 0 | 50 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt | 0 | 878561 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt | 0 | 927339 |
| IRS990/TrnsfrExmptNonChrtblRltdOrgInd | 0 | false |
| IRS990/TypeOfOrganizationCorpInd | 0 | X |
| IRS990/UnrelatedBusIncmOverLimitInd | 0 | false |
| IRS990/UponRequestInd | 0 | X |
| IRS990/USAddress/AddressLine1Txt | 0 | 600 ELDRIDGE ST |
| IRS990/USAddress/CityNm | 0 | WASHINGTON |
| IRS990/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/USAddress/ZIPCd | 0 | 61571 |
| IRS990/VotingMembersGoverningBodyCnt | 0 | 10 |
| IRS990/VotingMembersIndependentCnt | 0 | 10 |
| IRS990/WebsiteAddressTxt | 0 | WASHINGTONILHS.COM |
| IRS990/WhistleblowerPolicyInd | 0 | false |
| ReturnHeader/BuildTS | 0 | 2025-03-06 01:10:19Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | true |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | PATTY WAGNER |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | VICE PRESIDENT |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 7734250499 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2025-10-24 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | WASHINGTON HISTORICAL SOCIETY |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | WASH |
| ReturnHeader/Filer/EIN | 0 | 363495031 |
| ReturnHeader/Filer/PhoneNum | 0 | 7734250499 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 54 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | WASHINGTON |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | IL |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 61571 |
| ReturnHeader/IRSResponsiblePrtyInfoCurrInd | 0 | true |
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