| Barrie Historical Archive, Mailing Address | Barrie |
| Bayfield Historical Society, Archives & Heritage Centre, Bayfield Historical Society & Archives | Bluewater |
| Billy Bishop Home: Museum, Archives & National Historic Site | Owen Sound |
| Bruce County Museum & Cultural Centre | Saugeen Shores |
| Dufferin County., Museum of Dufferin | Mulmur |
| Grey County., Grey Roots Museum & Archives | Owen Sound |
| Northumberland County Archives and Museum | Cobourg |
| Peterborough Museum & Archives | Peterborough |
| Port Hope Archives | Port Hope (Municipality of) |
| Simcoe County Archives | Springwater |
| St. Marys Museum and Archives, St Marys Museum and Archive | St Marys |
| Stratford-Perth Archives | Stratford |
| Trent Valley Archives | Peterborough |