| Zoological Society of Philadelphia | PA |
| Zoological Association of America | FL |
| Zoo New England | MA |
| Xerces Society | OR |
| Wyoming Wildlife Advocates | WY |
| Wyoming Untrapped | WY |
| Wyoming Outdoor Council | WY |
| World Wildlife Fund | DC |
| World Stewardship Institute | CA |
| World Society for the Protection of Animals | MA |
| Wolf Recovery Foundation | ID |
| Wolf Hollow | MA |
| Wolf Haven International | WA |
| Wolf Education and Research Center | OR |
| Wolf Conservation Center | NY |
| Wissahickon Restoration Volunteers | PA |
| Wisconsin Audubon Council | WI |
| Wildlife Society | MD |
| Wildlife Rehabilitators Association of Massachusetts | MA |
| Wildlife for All | NM |
| Wildlife Alliance of Maine | ME |
| Wildlands Network | DC |
| Wilderness Study Group | TX |
| Wilderness Society | DC |
| Wild South | NC |
| WILD Foundation | CO |
| Wild Fish Conservancy | WA |
| Wild Farm Alliance | California |
| Wild Farm Alliance | CA |
| Wild Earth Guardians | NM |
| Wild Earth | TX |
| Wild Arizona | AZ |
| Whidbey Environmental Action Network | WA |
| Whale Conservation Institute | MA |
| Whale and Dolphin Conservation - North America | MA |
| Western Wildlife Outreach | Washington |
| Western Wildlife Conservancy | UT |
| Western Watersheds Project | ID |
| Western Watersheds Project | ID |
| Western North Carolina Alliance | NC |
| Western Nebraska Resources Council | NE |
| West Virgina Rivers Coalition | WV |
| West Michigan Environmental Action Council | MI |
| Waukesha County Environmental Action League | WI |
| Water Watch | OR |
| Washington Crossing Audubon Society | NJ |
| Walker Lake Working Group | NV |
| Voices of Wildlife in NH | NH |
| VOICE for Animals | ME |
| Virginia Society of Ornithology | VA |
| Virginia Herpetological Society | VA |
| Virginia Forest Watch | VA |
| Vet Voice Foundation | OR |
| Vernal Pool Association | MA |
| Vermont Audubon Society | VT |
| US PIRG | DC |
| Upper Missouri Breaks Audubon Society | MT |
| United Plant Savers | VA |
| United Church of Christ EcoAction | TX |
| Unitarian Universalists for the Ethical Treatment of Animals | VT |
| Unitarian Universalist Ministry for Earth | OR |
| Union of Concerned Scientists | DC |
| Turtle Island Restoration Network | CA |
| Turner Endangered Species Fund | MT |
| Tuolumne River Preservation Trust | CA |
| Tucson Audubon Society | AZ |
| Trout Unlimited Virginia | VA |
| Trout Unlimited (Oak Brook Chapter) | IL |
| Trout Unlimited | VA |
| Trevor Zoo | NY |
| Tortoise Group | NV |
| The Wildlife Society | MD |
| The Urban Wildlands Group | CA |
| The Union for Reform Judaism | NY |
| The Otter Project | CA |
| The Lands Council | WA |
| The Fund for Wild Nature | CA |
| The Endangered Species Conservation Site | CA |
| The Earth Island Institute | CA |
| The Conservation Angler | OR |
| The Conservation Agency | RI |
| The Caterpillar Lab | NH |
| The Activism Center at Wetlands Preserve | NY |
| Texas Conservation Alliance | TX |
| Tennessee Citizens for Wilderness Planning | TN |
| Tahoma Audubon | WA |
| Strong Foundation for Environmental Ethics | CA |
| Species Unite | NY |
| Southwestern Wisconsin Area Progressives (SWWAP) | WI |
| Southern Utah Wilderness Alliance | UT |
| Southern Resident Killer Whale Chinook Salmon Initiative | WA |
| Southern Maryland Audubon Society | MD |
| Southern Environmental Center | AL |
| South Shore Audubon Society | NY |
| South Carolina Wildlife Federation | SC |
| Society for the Protection of Insects | CA |
| Society for Conservation Biology | DC |
| Society and Animals Forum | MD |
| Sky Island Alliance | AZ |
| Siskyou Project | TX |
