| Canada. Border Services Agency, Border Information Service | Niagara Region |
| Canada. Canada Revenue Agency, Registered Disability Savings Plan (RDSP) | Ottawa |
| Canada. Elections Canada | Gatineau |
| Canada. Indigenous Services Canada, Indian Residential Schools Settlement Agreement | Gatineau |
| Halton. Regional Municipality of Halton, Access Halton - Government Information Centre | Oakville |
| Service Canada, Guelph, Service Canada Centre | Guelph |
| Service Canada, Service Canada, Mississauga Service Canada Centre | Mississauga |
| Service Canada, Old Age Security Programs, Ottawa - No Physical Address | Ottawa |
| Service Canada - Halton Region, Oakville, Federal Government Services | Oakville |
| Service Canada - Halton Region, Burlington, Federal Government Services | Burlington |
| Service Canada - Halton Region, Georgetown, Federal Government Services | Georgetown |
| Service Canada - Halton Region, Milton, Federal Government Services | Milton |
