| Barrie and District Labour Council, Barrie - No Physical Address | Barrie |
| International Brotherhood of Electrical Workers, Barrie Office, Local 353 | Barrie |
| International Union of Operating Engineers, No Physical Address, Local 793 | Barrie |
| Ontario English Catholic Teachers Association. Simcoe Muskoka Unit | Barrie |
| Ontario Nurses' Association, Orillia, Regional Office | Orillia |
| Ontario Secondary School Teachers' Federation, Barrie, Simcoe County District 17 | Barrie |
| SEIU Healthcare | Barrie |
| Simcoe County Elementary Teachers' Federation | Barrie |
| Stratford and District Labour Council | Stratford |
| Stratford Musicians' Association, American Federation of Musicians Local 418 | St Marys |
| United Association for Plumbers, Steamfitters and Welders, Barrie Office, Local 46 | Barrie |
| Universal Workers Union, Barrie Office, Local 183 of Laborers International Union of North America | Barrie |