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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 51-0243793

KNOX COUNTY HISTORICAL SITES INC

Tax-exempt (reinstated) · KNOXVILLE, IL 61448

Address and contacts

Address (IRS master file)
33 N PUBLIC SQ, KNOXVILLE, IL 61448-1378
Mailing address (990-N for 2025)
33 North Public Square, KNOXVILLE IL 61448
Principal officer (990-N for 2025)
PAT MANNHARDT, 139 N PUBLIC SQUARE, KNOXVILLE IL 61448

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 September, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025September 30, 2026February 16, 2027990-N on file
2024September 30, 2025February 17, 2026990-N on file
2023September 30, 2024February 18, 2025990-N on file

File the 2026 990-N for KNOX COUNTY HISTORICAL SITES INC

Due February 15, 2028 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
51-0243793
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (170(b)(1)(A)(vi))
Donations deductible (Pub 78)
Public charity, 50% deduction limit
Exempt since
2016
Accounting year ends
September
Files
Form 990-N (e-Postcard)

Revocation and reinstatement

Exemption revoked
March 15, 2013
Posted by the IRS
June 10, 2013
Reinstated
Effective December 15, 2016

From the IRS automatic revocation list: organizations that did not file a required return or e-Postcard for three consecutive years.

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: PAT MANNHARDT
September 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: PAT MANNHARDT
September 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: PAT MANNHARDT
September 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: PAT MANNHARDT
September 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Tom Myers
September 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2018
Officer: Margaret Bivens
September 30, 2019≤ $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 51-0243793).

Questions about KNOX COUNTY HISTORICAL SITES INC

What is the EIN of KNOX COUNTY HISTORICAL SITES INC?
The employer identification number (EIN) of KNOX COUNTY HISTORICAL SITES INC is 51-0243793.
Is KNOX COUNTY HISTORICAL SITES INC tax-exempt?
Yes. The IRS revoked its exemption on March 15, 2013 and reinstated it effective December 15, 2016.
Are donations to KNOX COUNTY HISTORICAL SITES INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does KNOX COUNTY HISTORICAL SITES INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of KNOX COUNTY HISTORICAL SITES INC due?
The return for tax year 2026 (the year ending September 30, 2027) is due February 15, 2028. Form 8868 extends it by six months; the 990-N cannot be extended.
When did KNOX COUNTY HISTORICAL SITES INC last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended September 30, 2026.
Who is the principal officer of KNOX COUNTY HISTORICAL SITES INC?
The 990-N for 2025 names PAT MANNHARDT.

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