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US nonprofit · EIN 510152634 · Aledo, ILiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 510152634) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe time served.Latest return IRS Form 990 series e-file data - 990EZ for the year to 31 December 2025: assets, liabilities, staff, website, telephone, pay.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue. Not a statement that the organisation is recruiting.Principal officer IRS Form 990-N (e-Postcard) - principal officer named for tax year 2022.Exemption status IRS Automatic Revocation of Exemption List (posted to 13 October 2026).Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Mercer County Historical Society

Donations deductible
Revenue
$101k
year to 31 December 2025
Expenses
$63k
year to 31 December 2025
Total assets
$20k
$0 liabilities
Net assets
$20k
assets less liabilities
Directors and trustees
1
3.4 years on average
Left since last filing
0
no seats appear to have opened
Officers and senior staff
1
named in Part VII
Activity
A50
Arts, culture and humanities
Exemption reinstated on 15 May 2011. The IRS had automatically revoked it on 15 May 2011 (after three years without a return). Source: IRS Automatic Revocation of Exemption List, posted to 13 October 2026.
How am I connected?

Mercer County Historical Society's network

1 personExplore in 3DiThe large node is Mercer County Historical Society. The map shows the people and organisations in the public record, two steps out at most. Hover a node to focus its connections; click one to open it.

The board

1 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record.
NameRole as filedSinceOn the board
Ronald DillavouPresident2023
3 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

1 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Debra SpenglerEmployee2023

Pay and hours

year to 31 December 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Ronald DillavouPresident0.5$0

No pay was reported for anyone in Part VII on this return.

About

Legal name
Mercer County Historical Society
EIN
510152634
Address
Po Box 269, Aledo, IL, 61231-0269
State
Illinois
Activity (NTEE)
A50 Arts, culture and humanities
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Arts, Culture & Humanities
Size band
2 (IRS master file code)
IRS ruling date
1 May 2014
Status
Code 01 (unconditional exemption)
Form 990 filings on record
1, latest 2023
IRS Publication 78
PC (contributions deductible)
Principal officer
Ronald Dillavou (Form 990-N, tax year 2022)

Most connected

Longest observed on the filings

≥3years on the filingsRonald Dillavou

Latest return

year to 31 December 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2025. US dollars, as filed.
Total assets
$20k
Total liabilities
$0
Net assets or fund balances
$20k