Illinois · Nonprofit
NORTHBROOK HISTORICAL SOCIETY
NORTHBROOK HISTORICAL SOCIETY (Illinois) receives grants from 3 organizations whose IRS filings report $5,262 to it, the largest being COBB FOUNDATION ($3,600). 3 of them have funded it in more than one year.
- Revenue FY2025
- $60k
- Funders on record
- 3
- Grants received
- $5k
- Net assets
- $705k
What Northbrook Historical Society does
Mission
To discover, collect, preserve and disseminate knowledge, which will establish or illustrate the history of the village of northbrook, its exploration, settlement, development and progress.
As stated on its FY2025 Form 990.
Programs
To maintain a house museum and historical archives which are staffed by unpaid volunteers. Both are open and available to the public, free of charge and to researchers worldwide via the societys website. An onsite consignment shop sells items to the public and items relavant to the societys mission. Details about the museum and the society can be found at : www.northbrookhistory.org
$56,257 spent$5,073 earned by the program100% of program spendingTo educate the public through programs and festivals which teach about the history of northbrook. One program offers 2nd, 3rd or 4th grade students from all local schools a half day at the museum learning about life and chores in the village in 1900. An annual community fall festival, historical plays and story telling, a cemetery walk, a garden walk, village birthday open house and free community and broader history related lectures in parthership with the library are offered.
The 2 programs described on its FY2025 Form 990, listed largest first by expense. Program spending in total: $56,257.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2023 to 2024, from $695k to $729k (+5%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2017 6% · 2018 17% · 2021 47% · 2022 53% · 2023 44% · 2024 68% · 2025 41%. Grants only. Government contracts and fees sit inside program revenue.
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 4 of the last 7 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Who funds it, year by year
2020 → 2023: the base narrowed from 3 funders to 2 funders, grant income fell $4k → $278.
1 of 3 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 2% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of NORTHBROOK HISTORICAL SOCIETY’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
NORTHBROOK HISTORICAL SOCIETY leans on a few funders — its largest provides 68% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
Largest funder’s share by year: 2020 94% · 2021 94% · 2022 65% · 2023 90% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
100% of NORTHBROOK HISTORICAL SOCIETY's grant income comes from Illinois funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $112 arriving through sponsors registered in 1 state is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Organizations like NORTHBROOK HISTORICAL SOCIETY
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Illinois
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
76% of spending goes to programs.
Governance
Public support
61%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for NORTHBROOK HISTORICAL SOCIETY: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds NORTHBROOK HISTORICAL SOCIETY?
- NORTHBROOK HISTORICAL SOCIETY (Illinois) receives grants from 3 organizations whose IRS filings report $5,262 to it, the largest being COBB FOUNDATION ($3,600). 3 of them have funded it in more than one year.
- How many funders does NORTHBROOK HISTORICAL SOCIETY have?
- IRS filings report 3 organizations giving $5,262 in grants to NORTHBROOK HISTORICAL SOCIETY, 3 of which have funded it in more than one year.
- Who is the largest funder of NORTHBROOK HISTORICAL SOCIETY?
- COBB FOUNDATION is the largest funder on record, with $3,600 in grants. The full list of funders is on this page.
- How can an organization like NORTHBROOK HISTORICAL SOCIETY find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Illinois. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Northbrook Historical Society →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 3 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing