| Bruce Grey Forest Festival | Hanover |
| Couchiching Conservancy (The) | Orillia |
| Ganaraska Region Conservation Authority, Port Hope - County Rd 28, Ganaraska Region Conservation Authority - Administration | Port Hope (Municipality of) |
| Georgian Bay Mnidoo Gamii Biosphere, Georgian Bay Biosphere Reserve | Parry Sound |
| Grey Sauble Conservation Authority | Owen Sound |
| Ministry of Natural Resources, District Office - Peterborough | Peterborough |
| Northumberland Land Trust | Cobourg |
| Ontario Woodlot Association, Huron Perth Chapter | Stratford |
| Ontario. Ministry of Natural Resources [Central East], Bracebridge Field Office | Bracebridge |
| Ontario. Ministry of Natural Resources [Central East], Midhurst District Office, Midhurst (Huronia) District Office | Springwater |
| Ontario. Ministry of Natural Resources [Central East], Owen Sound, Owen Sound Field Office | Owen Sound |
| Ontario. Ministry of Natural Resources [Central East], Parry Sound District Office, Southern Region | Parry Sound |
| Ontario. Ministry of Natural Resources [Central East], Peterborough - Mailing Address, Natural Resources Information and Support Centre | Peterborough |
| Ontario. Northern Development, Mines, Natural Resources and Forestry, Parry Sound District Office, Southern Region | Parry Sound |
| Otonabee Region Conservation Authority, Peterborough - Milroy Dr, Otonabee Region Conservation Authority - Administration | Peterborough |
| Sawyer Preservation Woodlot Association | West Perth |
| Sydenham Bruce Trail Club | Owen Sound |
| West Perth. Municipal Office, West Perth Thames Nature Trail and Wetlands | West Perth |