| National Humane Education Society | WV |
| National Audubon Society | DC |
| National Association of People with AIDS | MD |
| National Association of Biology Teachers (NABT) | VA |
| Naropa University | CO |
| Movement for a People's Party | CA |
| Mount Graham Coalition | TX |
| Morris Arboretum of the University of Pennsylvania | PA |
| Montana Wilderness Association | MT |
| Montana Audubon | MT |
| Missouri Botanical Garden | MO |
| Minnesota River Valley Audubon Chapter | MN |
| Minnesota Native Plant Society | MN |
| Michoacan Reforestation Fund | KS |
| Michigan Humane Society | MI |
| Michigan Environmental Council | MI |
| Massachusetts Society for the Prevention of Cruelty to Animals | MA |
| Massachusetts Audubon Society | MA |
| Maryland United for Peace and Justice | MD |
| Maryland PIRG | MD |
| Maryland Native Plant Society | MD |
| Maryland Alliance for Greenway Improvement and Conservation | MD |
| Marine Resources Council | FL |
| Marine Fish Conservation Network | DC |
| Maine Audubon Society | ME |
| Madison Audobon | WI |
| Lutheran School of Theology at Chicago | IL |
| Long Island Pine Barrens Society | NY |
| Lone Tree Council | MI |
| Lobos of the Southwest | AZ |
| League of Women Voters of the US | DC |
| League of Conservation Voters | DC |
| Last Chance Audubon Society | MT |
| Large Carnivore Fund | MT |
| Larch Company | DC |
| LandWatch Monterey County | CA |
| Lake Champlain Committee | VT |
| KS Wild | OR |
| Key West Wildlife Center | FL |
| Key Deer Protection Alliance | FL |
| Kettle Range Conservation Group | WA |
| Kentucky Heartwood | KY |
| Kalmiopsis Audubon Society | OR |
| Juniata Valley Audubon Society | PA |
| Juniata Valley Audubon Society | PA |
| John Muir Project of Earth Island Institute | CA |
| John G. Shedd Aquarium | IL |
| Jane Goodall Institute for Wildlife Research | VA |
| Jackson Hole Conservation Alliance | WY |
| Izaak Walton League, Rapid City, South Dakota Chapter | SD |
| IWLA - Allegheny County Chapter | PA |
| Iowa Wildlife Federation | IA |
| International Primate Protection League | SC |
| International Fund for Animal Welfare | DC |
| International Bird Rescue Research Center | CA |
| Indiana Forest Alliance | IN |
| In Defense of Animals | CA |
| Illinois Humane | IL |
| Idaho Conservation League | ID |
| Humane World for Animals | DC |
| Humane World Action Fund | DC |
| Humane Veterinary Medical Alliance | CA |
| Humane Action Pittsburgh | PA |
| Howling for Wolves | MN |
| Hoosier Environmental Council | IN |
| Herpetologists' League | KS |
| Hempen Goods | WI |
| Hells Canyon Preservation Council | OR |
| Heartwood | IN |
| Heal the Bay | CA |
| Hawk Mountain Sanctuary | PA |
| Harris Center for Conservation Education | NH |
| HabitatYou | IA |
| Gulf Specimen Marine Lab | FL |
| Gulf Restoration Network | LA |
| Greenpeace USA | DC |
| Greenbelt Alliance | CA |
| Green-Rock Audubon Society | WI |
| Greater Yellowstone Coalition | MT |
| Greater Wyoming Valley Audubon Society | PA |
| Great South Bay Audubon Society | NY |
| Great Plains Restoration Council | TX |
| Great Old Broads for Wilderness | CO |
| Great Lakes United | NY |
| Great Lakes Indian Fish and Widllfie Comission | WI |
| Grand Canyon Wolf Recovery Project | AZ |
| Grand Canyon Wildlands Council | AZ |
| Grand Canyon Trust | AZ |
| Government Accountability Project | DC |
| Gotham Bat Conservancy | New York |
| Glen Canyon Institute | UT |
| Georgia Native Plant Society | GA |
| Georgia Highlands College | GA |
| Gaviota Coast Conservancy | CA |
| Gasparilla Island Conservation | FL |
| Garden Club of America | NY |
| Fyke Nature Association | NJ |
| Friends of the Wisconsin Wolf & Wildlife | WI |
| Friends of the Sea Otter | CA |
| Friends of the San Juans | WA |
