| Friends of the Rivers of Virginia | VA |
| Friends of the Earth | DC |
| Friends of the Bay | NY |
| Friends of Swainson's Hawk | CA |
| Friends of Nevada Wilderness | NV |
| Friends of Merrymeeting Bay | ME |
| Friends of Buttonhook Forest Inc | NY |
| Friends of Blackwater | WV |
| Friends of Ballona Wetlands | CA |
| Friends of Animals | CT |
| Foundation for Global Sustainability | TN |
| Forest Carbon Coalition | OR |
| Fly Fishers International | MT |
| Florida Conservation Voters | FL |
| Florida Audubon | FL |
| Farallones Marine Sanctuary Association | CA |
| Episcopal Diocese of Maryland's Committee on the Environment | MD |
| Environmental Protection Information Center | CA |
| Environmental Law Society, Vermont Law School | VT |
| Environmental Law Society, University of Michigan | MI |
| Environmental Education Fund | NJ |
| Environmental Defense Fund | DC |
| Environmental Defense Center | CA |
| Environmental Defenders of McHenry County | IL |
| Environmental Council of Rhode Island | RI |
| Environmental Commons | CA |
| Environmental Action Committee of West Marin (EAC) | CA |
| Environment America | DC |
| Environment Action | MA |
| Endangered Small Animal Conservation Fund | IL |
| Endangered Habitats League | CA |
| Ecology Mission Group,Central Baptist Church,Wayne | PA |
| Ecology Center of Ann Arbor, Inc. | MI |
| Eastern Mennonite Missions | PA |
| East Michigan Environmental Action Council | MI |
| Earthjustice | DC |
| EarthAction | MA |
| Earth Rangers | TX |
| Earth Law Center | CO |
| Earth Island Institute | CA |
| Earth Guardians | CO |
| Earth Day Network | DC |
| Earth Action | MA |
| Dogwood Alliance | NC |
| Difference Makers Media | IL |
| Desert Fishes Council | CA |
| Delaware Riverkeeper Network | PA |
| Delaware Ecumenical Council | DE |
| Delaware Center for Inland Bays | DE |
| Defenders of Wildlife | DC |
| DC Natives | DC |
| Darby Creek Valley Association | PA |
| CU Wildlife Club | CO |
| Creature Conserve, Inc. | RI |
| Creation Justice Ministries | DC |
| Cougar Rewilding Foundation | WV |
| Cosmic Sister | MA |
| Cosley Zoo | IL |
| Cornell Greens | NY |
| Conservation Northwest | WA |
| Conservation Law Foundation | ME |
| Conservation Fisheries | TN |
| Conservation Council for Hawai'i | HI |
| Conservation Alliance of the Great Plains | NE |
| Conservancy of Southwest Florida | FL |
| Connecticut Association of Conservation and Inland Wetlands Commissions | CT |
| Coastal Plains Institute | FL |
| Coast Range Association | OR |
| Coalition on the Environment and Jewish Life | NY |
| Citizens United for Animals | WI |
| Church & Society, The United Methodist Church | DC |
| Chewonki Foundation | ME |
| Chattooga Conservancy | GA |
| Cetacean Society International | CT |
| Center for Wildlife Information | MT |
| Center for Biological Diversity | DC |
| Cascadia Wildlands | OR |
| Cascadia Forest Defenders | OR |
| Canada Goose Project | NY |
| Cambridge Woodfire Pottery | WI |
| California Wilderness Coalition | CA |
| California Trout | CA |
| California Native Plant Society | CA |
| Butterfly Farms.org | CA |
| Butte Environmental Council | CA |
| Buffalo Outdoor Center | AR |
| Buffalo Field Campaign | MT |
| Bucks County Audubon Society | PA |
| Buckeye Environmental Network | OH |
| Bowling Green-Warren County Humane Society | KY |
| Boulder Rights of Nature | CO |
| Born Free | MD |
| Black Bear Conservation Coalition | LA |
| BirdNote | WA |
| Berkshire Environmental Action Team (BEAT) | MA |
| Bear Trust International | MT |
| Bay Area Action | CA |
| Bay Area Action | CA |
| Bat Conservation International | TX |
| Augusta Bird Club | VA |
