MARYLAND ORNITHOLOGICAL SOCIETY is a Public Charity headquartered in BALTIMORE, MD. Financial data from the 2025 filing: $179K revenue, $215K expenses, $3.8M total assets. 1 publicly reported grants to this organization, totaling roughly $5K, appear in IRS filings.
THE MARYLAND ORNITHOLOGICAL SOCIETY (MOS) PROMOTES THE STUDY AND ENJOYMENT OF BIRDS, PROMOTES KNOWLEDGE ABOUT NATURAL RESOURCES, AND FOSTERS ITS APPRECIATION AND CONSERVATION, MAINTAINS A SYSTEM OF SANCTUARIES TO ENCOURAGE THE CONSERVATION OF BIRDS AND BIRD HABITAT, AND TO HELP RECORD AND PUBLISH OBSERVATIONS OF BIRD LIFE.
How Maryland Ornithological Society divides every $100 it spends, from its own Form 990 filings, averaged across 9 years.
No fundraising costs are reported. That often means fundraising runs through a separate affiliated organization that files its own return.
Source: Form 990 filings with the IRS, latest fiscal year 2025. Shares are from the organization's reported expenses. Data by Imperigo; not affiliated with the IRS.
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 | $179K | $215K | $3.8M |
| 2024 | $147K | $133K | $3.7M |
| 2023 | $145K | $138K | $3.7M |
| 2022 | $188K | $128K | $3.7M |
| 2021 | $95K | $89K | $3.9M |
Between 2021 and 2025, reported annual revenue grew from $95K to $179K (+88%), with total assets most recently reported at $3.8M.
Interactive year-over-year charts and full filing details available with membership.
