Environment
The IRS classifies 28,775 tax-exempt organizations under Environment, rank 13 of 25 major groups. 2,931 of them have a Form 990 on record.
American Factbook Research
At a glance
- 28,775
- Organizations classified here
- By the code the IRS assigned at registration.
- 27,605
- Recognised under 501(c)(3)
- The charitable subsection.
- 2,931
- With a Form 990 on record
- The only organizations with financial figures here.
- $22,880,071,691
- Revenue reported
- Summed across filings, each for a different year.
- $662,364,100
- Largest single organization
- Revenue on its most recent filing.
- 2.1%
- Share of all classified organizations
- Of the organizations that carry a classification code at all.
Taken from the IRS on September 19, 2026. 574,213 organizations carry no code and appear in no category.
Largest by revenue
2 more columns on a wider screen
| Rank | Organization | Revenue |
|---|---|---|
| 1 | NEW VENTURE FUND | $662,364,100 |
| 2 | ENVIRONMENTAL DEFENSE FUND INCORPORATED | $443,267,772 |
| 3 | DUCKS UNLIMITED INC | $380,340,506 |
| 4 | WORLD WILDLIFE FUND INC | $366,655,209 |
| 5 | CENTER FOR SUSTAINABLE ENERGY | $335,556,775 |
| 6 | THE CONSERVATION FUND A NONPROFIT CORPORATION | $329,373,956 |
| 7 | CONSERVATION INTERNATIONAL FOUNDATION | $308,673,004 |
| 8 | WINDWARD FUND | $308,245,754 |
| 9 | TRUST FOR PUBLIC LAND | $297,379,545 |
| 10 | SIXTEEN THIRTY FUND | $282,241,759 |
| 11 | CLIMATE IMPERATIVE FOUNDATION | $271,730,022 |
| 12 | ISO NEW ENGLAND INC | $264,594,190 |
| 13 | ENERGY TRUST OF OREGON INC | $251,243,122 |
| 14 | NATURAL RESOURCES DEFENSE COUNCIL INC | $193,144,386 |
| 15 | EARTHJUSTICE | $170,827,511 |
Other categories
- Religion-Related 205,231
- Education 187,152
- Human Services 155,311
- Arts, Culture and Humanities 119,112
- Recreation and Sports 114,077
- Philanthropy, Voluntarism and Grantmaking Foundations 105,360
- Community Improvement and Capacity Building 72,768
- Youth Development 58,598
- Health Care 46,264
- Animal-Related 41,759
- Public and Societal Benefit 35,502
- Housing and Shelter 31,219
- Mental Health and Crisis Intervention 27,729
- Public Safety, Disaster Preparedness and Relief 22,615
- International, Foreign Affairs and National Security 21,403
- Food, Agriculture and Nutrition 20,601
- Mutual and Membership Benefit 17,541
- Employment 15,877
- Crime and Legal-Related 15,224
- Voluntary Health Associations and Medical Disciplines 14,090
- Civil Rights, Social Action and Advocacy 11,425
- Science and Technology 6,882
- Medical Research 6,317
- Social Science 1,843
What this classification is
- The IRS assigns a code when it recognises an organization and rarely revisits it. This describes what an organization said it would do at registration, which may not be what it does now.
- Around three in ten recognised organizations carry no code at all, concentrated among older registrations and non-charitable subsections. They are in none of these categories and are counted on the hub instead.
- The names here are the IRS’s own. Other publishers use a revised taxonomy with different names for several groups, so a figure here will not always line up with one of theirs carrying a similar label.
Full method at methodology.
Sources
- Exempt Organizations Business Master File — Internal Revenue Service · U.S. Government work, public domain (17 U.S.C. 105) · retrieved September 21, 2026
- Form 990 series e-file data · retrieved September 19, 2026
Data retrieved