CHICAGO ORNITHOLOGICAL SOCIETY is a Small Public Charity headquartered in CHICAGO, IL. Financial data from the 2025 filing: $36K revenue, $23K expenses, $246K total assets. 1 publicly reported grants to this organization, totaling roughly $5K, appear in IRS filings.
The organization's primary exempt purpose is to promote the appreciation, study, and conservation of birds and their habitats throughout the Chicago region by providing educational programs, organizing bird-watching field trips, supporting habitat restoration and conservation initiatives, and engaging in outreach and advocacy efforts that encourage the protection of bird species and the natural environments on which they depend.
Showing up to 5 of 1 total records — full history available with membership.
Officer compensation and complete director data available with membership.
| Year | Revenue | Expenses | Assets |
|---|---|---|---|
| 2025 | $36K | $23K | $246K |
| 2024 | $30K | $24K | $226K |
| 2023 | $32K | $27K | $218K |
| 2022 | $110K | $30K | $209K |
Between 2022 and 2025, reported annual revenue declined from $110K to $36K (-67%), with total assets most recently reported at $246K.
Interactive year-over-year charts and full filing details available with membership.
