Nonprofit · EIN 37-1011900
CAHOKIA MOUNDS MUSEUM SOCIETY
Tax-exempt · COLLINSVILLE, IL 62234
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $128,622 | $153,746 | -$25,124 | $720,602 | $720 | $719,882 |
| December 31, 2024 | 990 | $151,070 | $191,460 | -$40,390 | $735,277 | $412 | $734,865 |
| December 31, 2023 | 990 | $114,757 | $202,782 | -$88,025 | $818,524 | $2,046 | $816,478 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $55,760
- Membership dues
- $9,676
- Program service revenue
- $0
- Investment income
- $25,267
- Net gain from sales of assets
- $19,528
- Net income from fundraising events
- $18,672
- Net income from sales of inventory
- $28,923
- Other revenue
- $47,595
Expenses
- Grants and similar amounts paid
- $0
- Other salaries and wages
- $54,101
- Salaries, compensation and benefits (total)
- $59,193
- Professional fundraising fees
- $0
- Accounting fees
- $19,794
- Depreciation
- $30,027
- Program services (functional)
- $88,481
- Management and general (functional)
- $59,063
- Fundraising (functional)
- $6,202
Balance sheet and other
- Total assets, start of year
- $735,277
- Total assets, end of year
- $720,602
- Total liabilities, end of year
- $720
- Net assets, end of year
- $719,882
- Land, buildings and equipment
- $30,951
- Publicly traded securities
- $412,979
- Net assets without donor restrictions
- $544,537
- Net assets with donor restrictions
- $175,345
- Gross receipts
- $250,666
- Employees
- 3
- Year formed
- 1976
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DALE YONKER | PRESIDENT Trustee or director, Officer | – | $0 |
| CHRIS FRILLMAN | VICE PRESIDE Trustee or director, Officer | – | $0 |
| WILLIAM MEISTER | TREASURER Trustee or director, Officer | – | $0 |
| LINDA KUNZ | DIRECTOR Trustee or director | – | $0 |
| HONORABLE GERALD COHN | DIRECTOR Trustee or director | – | $0 |
| LAWRENCE O TALIANA | DIRECTOR Trustee or director | – | $0 |
| F TERRY NORRIS PHD | DIRECTOR Trustee or director | – | $0 |
| KENNETH WILLIAMS | DIRECTOR Trustee or director | – | $0 |
| JACK KERBER | DIRECTOR Trustee or director | – | $0 |
| JUDY HORTON | DIRECTOR Trustee or director | – | $0 |
990 for the year ended December 31, 2024: 12 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DALE YONKER | PRESIDENT Trustee or director, Officer | 1 | $0 |
| CHRIS FRILLMAN | VICE PRESIDE Trustee or director, Officer | 1 | $0 |
| WILLIAM MEISTER | TREASURER Trustee or director, Officer | 1 | $0 |
| MATT LOYET | SECRETARY Trustee or director, Officer | 1 | $0 |
| LINDA KUNZ | DIRECTOR Trustee or director | 1 | $0 |
| HONORABLE GERALD COHN | DIRECTOR Trustee or director | 1 | $0 |
| LAWRENCE O TALIANA | DIRECTOR Trustee or director | 1 | $0 |
| F TERRY NORRIS PHD | DIRECTOR Trustee or director | 1 | $0 |
| KENNETH WILLIAMS | DIRECTOR Trustee or director | 1 | $0 |
| JACK KERBER | DIRECTOR Trustee or director | 1 | $0 |
| JUDY HORTON | DIRECTOR Trustee or director | 1 | $0 |
| JUSTIN SMOCK | DIRECTOR Trustee or director | 1 | $0 |
990 for the year ended December 31, 2023: 11 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| HONORABLE GERALD COHN | DIRECTOR Trustee or director | – | $0 |
| CHRIS FRILLMAN | VICE PRESIDE Trustee or director, Officer | – | $0 |
| JUDY HORTON | DIRECTOR Trustee or director | – | $0 |
| JACK KERBER | DIRECTOR Trustee or director | – | $0 |
| LINDA KUNZ | TREASURER Trustee or director, Officer | – | $0 |
| MATT LOYET | SECRETARY Trustee or director, Officer | – | $0 |
| WILLIAM MEISTER | PRESIDENT Trustee or director, Officer | – | $0 |
| F TERRY NORRIS PHD | DIRECTOR Trustee or director | – | $0 |
| LAWRENCE O TALIANA | DIRECTOR Trustee or director | – | $0 |
| KENNETH WILLIAMS | DIRECTOR Trustee or director | – | $0 |
| DALE YONKER | DIRECTOR Trustee or director | – | $0 |
Address and contacts
- Address (IRS master file)
- 30 RAMEY DR, COLLINSVILLE, IL 62234-7617
- Principal officer (990 for 2025)
- DALE YONKER, 209 WEST STONYBROOK DR, OFALLON, IL 62269
- Signed the 990
- DALE YONKER, PRESIDENT
- Phone
- (618) 344-7316
- Website
- WWW.CAHOKIAMOUNDS.ORG
- Return prepared by
- SMITH PATRICK PC
Mission
EDUCATING THE PUBLIC ON HISTORIC CAHOKIA
Program accomplishments
- RE-DISCOVER CAHOKIA, INDIAN ART SHOW, KIDS DAY, AND VARIOUS EDUCATIONAL CLASSESExpenses $88,481
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 37-1011900
- 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
- 1978
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Arts, culture and humanities (A115)
- Assets (IRS master file)
- $720,602
- Income (IRS master file)
- $250,666
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $128,622 | $153,746 | $720,602 | XML |
| 990 | December 2024 | $151,070 | $191,460 | $735,277 | XML |
| 990 | December 2023 | $114,757 | $202,782 | $818,524 | XML |
| 990 | December 2022 | $145,409 | $212,626 | $873,501 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
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 37-1011900).
Questions about CAHOKIA MOUNDS MUSEUM SOCIETY
- What is the EIN of CAHOKIA MOUNDS MUSEUM SOCIETY?
- The employer identification number (EIN) of CAHOKIA MOUNDS MUSEUM SOCIETY is 37-1011900.
- Is CAHOKIA MOUNDS MUSEUM SOCIETY tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1978.
- Are donations to CAHOKIA MOUNDS MUSEUM SOCIETY tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does CAHOKIA MOUNDS MUSEUM SOCIETY file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of CAHOKIA MOUNDS MUSEUM SOCIETY due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did CAHOKIA MOUNDS MUSEUM SOCIETY last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of CAHOKIA MOUNDS MUSEUM SOCIETY?
- The 990 for the year ended December 31, 2025 names DALE YONKER.
- Who are the officers and directors of CAHOKIA MOUNDS MUSEUM SOCIETY?
- The 990 for the year ended December 31, 2025 lists 10 people; 0 received compensation from the organization.
- How much revenue does CAHOKIA MOUNDS MUSEUM SOCIETY have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $128,622, expenses of $153,746 and total assets of $720,602 at year end.
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