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Nonprofit · EIN 23-7389090

WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC

Tax-exempt · OSHKOSH, WI 54901

Address and contacts

Address (IRS master file)
234 CHURCH AVE, OSHKOSH, WI 54901-4748
In care of
% AMELIA CRANE
Mailing address (990-N for 2025)
234 Church Avenue, Oshkosh WI 54901
Principal officer (990-N for 2025)
Austin Frederick, 234 Church Avenue, Oshkosh WI 54901

What it must file and when

IRS records say it files Form 990-N (e-Postcard). Gross receipts normally $50,000 or less. Its accounting year ends in May, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025May 31, 2026October 15, 2026990-N on file
2024May 31, 2025October 15, 2025990-N on file
2023May 31, 2024October 15, 2024990-N on file

File the 2026 990-N for WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC

Due October 15, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
23-7389090
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (509(a)(2))
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
1974
Accounting year ends
May
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Austin Frederick
May 31, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Austin Frederick
May 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Austin M Frederick
May 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Austin Frederick
May 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2021
Officer: Randy Domer
May 31, 2022≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Randy Domer
May 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Randy Domer
May 31, 2020≤ $50,000 receipts––e-Postcard

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 23-7389090).

Questions about WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC

What is the EIN of WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC?
The employer identification number (EIN) of WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC is 23-7389090.
Is WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1974.
Are donations to WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC due?
The return for tax year 2026 (the year ending May 31, 2027) is due October 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended May 31, 2026.
Who is the principal officer of WINNEBAGO COUNTY HISTORICAL AND ARCHEOLOGICAL SOCIETY INC?
The 990-N for 2025 names Austin Frederick.

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