<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" returnVersion="2023v5.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-05-14T11:58:11-04:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>391901322</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>LATTAHARRIS LLP</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>618 G AVE PO BOX 38</AddressLine1Txt>
        <CityNm>GRUNDY CENTER</CityNm>
        <StateAbbreviationCd>IA</StateAbbreviationCd>
        <ZIPCd>50638</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>474258239</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>GRUNDY CENTER CHAMBER-MAIN STREET</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>GRUN</BusinessNameControlTxt>
      <PhoneNum>3198245221</PhoneNum>
      <USAddress>
        <AddressLine1Txt>703 F AVE</AddressLine1Txt>
        <CityNm>GRUNDY CENTER</CityNm>
        <StateAbbreviationCd>IA</StateAbbreviationCd>
        <ZIPCd>50638</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>JILL THEDE</PersonNm>
      <PersonTitleTxt>TREASURER</PersonTitleTxt>
      <PhoneNum>3198245221</PhoneNum>
      <SignatureDt>2024-05-14</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>JILL</PersonFirstNm>
        <PersonLastNm>THEDE</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>true</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>BLAINE T MOATS</PreparerPersonNm>
      <PTIN>P00022150</PTIN>
      <PhoneNum>3198245221</PhoneNum>
      <PreparationDt>2024-05-14</PreparationDt>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990EZ documentId="RetDoc1" referenceDocumentId="RetDoc2">
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <WebsiteAddressTxt>GRUNDYCENTERCMS.ORG</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="RetDoc3">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>31059</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>25815</ContributionsGiftsGrantsEtcAmt>
      <InvestmentIncomeAmt>95</InvestmentIncomeAmt>
      <FundraisingGrossIncomeAmt>4399</FundraisingGrossIncomeAmt>
      <SpecialEventsDirectExpensesAmt>2004</SpecialEventsDirectExpensesAmt>
      <SpecialEventsNetIncomeLossAmt>2395</SpecialEventsNetIncomeLossAmt>
      <OtherRevenueTotalAmt>750</OtherRevenueTotalAmt>
      <TotalRevenueAmt>29055</TotalRevenueAmt>
      <GrantsAndSimilarAmountsPaidAmt>800</GrantsAndSimilarAmountsPaidAmt>
      <FeesAndOtherPymtToIndCntrctAmt>8864</FeesAndOtherPymtToIndCntrctAmt>
      <OccupancyRentUtltsAndMaintAmt>1766</OccupancyRentUtltsAndMaintAmt>
      <PrintingPublicationsPostageAmt>564</PrintingPublicationsPostageAmt>
      <OtherExpensesTotalAmt>15068</OtherExpensesTotalAmt>
      <TotalExpensesAmt>27062</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>1993</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>95666</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>97659</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>96126</BOYAmt>
        <EOYAmt>101618</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>985</BOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>97111</BOYAmt>
        <EOYAmt>101618</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>1445</BOYAmt>
        <EOYAmt>3959</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>95666</BOYAmt>
        <EOYAmt>97659</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <PrimaryExemptPurposeTxt>THE PURPOSE OF THIS CORPORATION SHALL BE TO EDUCATE THE COMMUNITY AND AREA BUSINESSES ON HISTORIC COMMERCIAL PRESERVATION, TO PROMOTE AN INTEREST IN THE HISTORY AND ARCHITECTURAL INTEGRITY AND PRESERVATION OF GRUNDY CENTER, IOWA, TO PROVIDE DESIGN ASSISTANCE, BUSINESS RESTRUCTURING ASSISTANCE, AND TO ORGANIZE COMMUNITY VOLUNTEERS IN THE FURTHERANCE OF THESE GOALS SO AS TO FOSTER EXCELLENCE IN ALL ASPECTS OF THE MAIN STREET GRUNDY CENTER.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>THE PURPOSE OF THIS CORPORATION SHALL BE TO EDUCATE THE COMMUNITY AND AREA BUSINESSES ON HISTORIC COMMERCIAL PRESERVATION, TO PROMOTE AN INTEREST IN THE HISTORY AND ARCHITECTURAL INTEGRITY AND PRESERVATION OF GRUNDY CENTER, IOWA, TO PROVIDE DESIGN ASSISTANCE, BUSINESS RESTRUCTURING ASSISTANCE, AND TO ORGANIZE COMMUNITY VOLUNTEERS IN THE FURTHERANCE OF THESE GOALS SO AS TO FOSTER EXCELLENCE IN ALL ASPECTS OF THE MAIN STREET GRUNDY CENTER.</DescriptionProgramSrvcAccomTxt>
        <GrantsAndAllocationsAmt>800</GrantsAndAllocationsAmt>
        <ProgramServiceExpensesAmt>25662</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>25662</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>SHANNON SIMMS</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KATIE LEWIS</PersonNm>
        <TitleTxt>VICE-PRESIDE</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>JILL THEDE</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KEELY HARKEN</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>DENISE GRAVES</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>RYAN RASMUSSEN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KARA HIBDON</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>PAUL EBERLINE</PersonNm>
        <TitleTxt>EX OFFICIO</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>RICK SMITH</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>KATIE RASMUSSEN</PersonNm>
        <TitleTxt>EX OFFICIO</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>EMMA SPANGENBURG</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>ANDREW REICHERT</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>000.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <BooksInCareOfDetail>
        <PersonNm>JILL THEDE</PersonNm>
        <USAddress>
          <AddressLine1Txt>618 G AVE</AddressLine1Txt>
          <CityNm>GRUNDY CENTER</CityNm>
          <StateAbbreviationCd>IA</StateAbbreviationCd>
          <ZIPCd>50638</ZIPCd>
        </USAddress>
        <PhoneNum>3198245221</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="RetDoc3">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>126689</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>64460</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>30702</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>30958</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>25815</CurrentTaxYearAmt>
        <TotalAmt>278624</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <GovtFurnSrvcFcltsVl170Grp>
        <CurrentTaxYearMinus4YearsAmt>500</CurrentTaxYearMinus4YearsAmt>
        <TotalAmt>500</TotalAmt>
      </GovtFurnSrvcFcltsVl170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>127189</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>64460</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>30702</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>30958</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>25815</CurrentTaxYearAmt>
        <TotalAmt>279124</TotalAmt>
      </TotalCalendarYear170Grp>
      <PublicSupportTotal170Amt>279124</PublicSupportTotal170Amt>
      <TotalSupportAmt>279124</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>61719</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>1.00000</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>1.00000</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleO documentId="RetDoc2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART I, LINE 8</FormAndLineReferenceDesc>
        <ExplanationTxt>DIRECTOR COACHING STIPEND 750 TOTAL 750</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART I, LINE 16</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPENSES ADVERTISING 3,238 DUES 958 SUPPLIES 3,464 CREDIT CARD PROCESSING FEES 87 COMPUTER/WEBSITE EXPENSE 640 CONFERENCES &amp; MEETINGS 692 MEETINGS - FOOD &amp; BEVERAGE 899 CONFERENCE LODGING 1,560 CONFERENCE TRAVEL 1,234 PROPERTY INSURANCE 896 DIRECTOR &amp; OFFICER INSURANCE 1,400 TOTAL 15,068</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART II, LINE 24</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTS RECEIVABLE 985 0 TOTAL 985 0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART II, LINE 26</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTS PAYABLE AND ACCRUED EXPENSE 1,445 3,959</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PURPOSE OF THIS CORPORATION SHALL BE TO EDUCATE THE COMMUNITY AND AREA BUSINESSES ON HISTORIC COMMERCIAL PRESERVATION, TO PROMOTE AN INTEREST IN THE HISTORY AND ARCHITECTURAL INTEGRITY AND PRESERVATION OF GRUNDY CENTER, IOWA, TO PROVIDE DESIGN ASSISTANCE, BUSINESS RESTRUCTURING ASSISTANCE, AND TO ORGANIZE COMMUNITY VOLUNTEERS IN THE FURTHERANCE OF THESE GOALS SO AS TO FOSTER EXCELLENCE IN ALL ASPECTS OF THE MAIN STREET GRUNDY CENTER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990-EZ, PART III, LINE 28</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PURPOSE OF THIS CORPORATION SHALL BE TO EDUCATE THE COMMUNITY AND AREA BUSINESSES ON HISTORIC COMMERCIAL PRESERVATION, TO PROMOTE AN INTEREST IN THE HISTORY AND ARCHITECTURAL INTEGRITY AND PRESERVATION OF GRUNDY CENTER, IOWA, TO PROVIDE DESIGN ASSISTANCE, BUSINESS RESTRUCTURING ASSISTANCE, AND TO ORGANIZE COMMUNITY VOLUNTEERS IN THE FURTHERANCE OF THESE GOALS SO AS TO FOSTER EXCELLENCE IN ALL ASPECTS OF THE MAIN STREET GRUNDY CENTER.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
