| AWARE Simcoe | Simcoe County |
| Economic Development Corporation of North Simcoe, Midland, Economic Development Corporation of North Simcoe (EDCNS) | Midland |
| Environment Network | Collingwood |
| Green Communities Canada | Peterborough |
| Lake Huron Coastal Centre, No Physical Address | Goderich |
| Muskoka Field Naturalist Club, Muskoka - No Physical Address | Bracebridge |
| Nature League, Collingwood - Mailing Address | Collingwood |
| Nottawasaga Valley Conservation Authority, Tiffin Centre for Conservation | Utopia |
| Ontario Public Interest Research Group, Peterborough | Peterborough |
| Ramara Township, Infrastructure, Brechin - 2297 Hwy 12 | Ramara |
| Rescue Lake Simcoe Coalition | Aurora |
| Severn Sound Environmental Association | Tay |
| Severn Sound Source Protection Authority, Drinking Water Source Protection | Tay |
| Sierra Club Canada Foundation, Mailing Address, Sierra Club Canada | Ottawa |
| Simcoe County Greenbelt Coalition, Mailing Address | Simcoe |
| South Simcoe Streams Network | New Tecumseth |
| Sustainability Project (The) | Brockton |
| Transition Town Peterborough, Mailing Address | Peterborough |