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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 1a:</FormAndLineReferenceDesc>
        <ExplanationTxt>Collections: The collections, which were acquired through purchases and contributions since the Society's inception, are not recognized as assets on the statement of financial position. Purchases of collection items are recorded as decreases in unrestricted net assets in the year in which the items are acquired, or as temporarily or permanently restricted net assets if the assets used to purchase the items are restricted by donors. Contributed collection items are not reflected on the financial statements. Proceeds from deaccessions are reflected as increases in the appropriate net asset classes.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV, Line 2b:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Maine Historical Society agrees to serve as the fiscal sponsor for the Merrymeeting Bay Pioneers Project for the purpose of funding from the Merrymeeting Bay Trust to pay for expenses for the Merrymeeting Bay archeological project.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>Management does not believe it has taken any positions that would require the recording of any tax liability nor does it believe that there are any tax benefits that would either increase or decrease within the next year.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Fundraising Expenses Netted with Revenue 44,615.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Fundraising Expenses Netted with Revenue 44,615. Expenses of related organization on consolidated financials 12,251.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>Maine History Maker</Event1Nm>
        <GrossReceiptsEvent1Amt>96025</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>51860</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>44165</GrossRevenueEvent1Amt>
        <FoodAndBeverageEvent1Amt>16595</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>2269</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>25002</OtherDirectExpensesEvent1Amt>
        <Event2Nm>Beer in the Garden</Event2Nm>
        <GrossReceiptsEvent2Amt>450</GrossReceiptsEvent2Amt>
        <CharitableContriEvent2Amt>0</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>450</GrossRevenueEvent2Amt>
        <FoodAndBeverageEvent2Amt>269</FoodAndBeverageEvent2Amt>
        <OtherDirectExpensesEvent2Amt>480</OtherDirectExpensesEvent2Amt>
        <GrossReceiptsTotalAmt>96475</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>51860</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>44615</GrossRevenueTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>16864</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>2269</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>25482</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>44615</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>0</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>At its April 2024 meeting, the MHS Board of Trustees adopted revised Bylaws that (i) transferred election of Trustees from the Members of Maine Historical Society to the Board of Trustees, and (ii) authorized electronic participation and voting by the Board of Trustees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The society offers membership, for an annual membership fee, to the general public which come with certain benefits and rights.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Members of the MHS Board of Trustees are elected to the Board of Trustees by the Board of Trustees on an annual basis. Trustees serve three-year terms and may serve up to three consecutive three-year terms. The Governance Committee receives, reviews, and nominates candidates to the Board of Trustees for election.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Director of Finance and the Treasurer review the return and present it to the Board of Trustees for approval prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Conflict of interest policy is signed annually in annual review with senior management.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation is compared to like institutions from data from the National Comparative Museum Study and other independent survey.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Documents are included in meeting minutes available to the public in our Annual Report, on our website, and upon request. This includes the 990 itself.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Expenses: Program service expenses 43,287. Management and general expenses 10,285. Fundraising expenses 619. Total expenses 54,191. Photography: Program service expenses 23,088. Management and general expenses 4,200. Fundraising expenses 19,747. Total expenses 47,035. Moving Expenses: Program service expenses 31,958. Management and general expenses 0. Fundraising expenses 0. Total expenses 31,958. Gifts and Entertainment: Program service expenses 1,397. Management and general expenses 3,129. Fundraising expenses 22,895. Total expenses 27,421. Supplies: Program service expenses 16,934. Management and general expenses 4,414. Fundraising expenses 4,342. Total expenses 25,690. Exhibit Expenses: Program service expenses 24,397. Management and general expenses 0. Fundraising expenses 0. Total expenses 24,397. Telephone: Program service expenses 13,876. Management and general expenses 10,017. Fundraising expenses 0. Total expenses 23,893. Application &amp; Website Subscription: Program service expenses 12,125. Management and general expenses 3,609. Fundraising expenses 6,520. Total expenses 22,254. JANITORIAL SERVICE/ SUPPLIES: Program service expenses 9,908. Management and general expenses 7,122. Fundraising expenses 0. Total expenses 17,030. Postage: Program service expenses 9,581. Management and general expenses 4,762. Fundraising expenses 0. Total expenses 14,343. Bank Fees: Program service expenses 1,714. Management and general expenses 9,760. Fundraising expenses 0. Total expenses 11,474. Security: Program service expenses 3,621. Management and general expenses 2,603. Fundraising expenses 0. Total expenses 6,224. Staff Development: Program service expenses 2,529. Management and general expenses 1,800. Fundraising expenses 1,797. Total expenses 6,126. DUES/MEMBERSHIPS: Program service expenses 2,711. Management and general expenses 1,571. Fundraising expenses 740. Total expenses 5,022. Program Expenses: Program service expenses 1,980. Management and general expenses 0. Fundraising expenses 992. Total expenses 2,972. Equipment: Program service expenses 172. Management and general expenses 1,652. Fundraising expenses 0. Total expenses 1,824. Permits and Fees: Program service expenses 0. Management and general expenses 550. Fundraising expenses 0. Total expenses 550. Bad Debt Expense: Program service expenses 0. Management and general expenses 0. Fundraising expenses 460. Total expenses 460. Conservation: Program service expenses 297. Management and general expenses 0. Fundraising expenses 0. Total expenses 297. Collections Purchased: Program service expenses 115. Management and general expenses 0. Fundraising expenses 0. Total expenses 115.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>There have been no changes in the process from the prior year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MHS INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>485 CONGRESS STREET</AddressLine1Txt>
          <CityNm>PORTLAND</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04101</ZIPCd>
        </USAddress>
        <EIN>010476908</EIN>
        <PrimaryActivitiesTxt>HOLDS BUILDING USED BY MAINE HISTORICAL SOCIETY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>ME</LegalDomicileStateCd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>1</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>MHS Inc</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>K</TransactionTypeTxt>
        <InvolvedAmt>10</InvolvedAmt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>