| Business | Phone |
| Ivan Grose Mp 1 Mary St N #C, Oshawa L1G 7W8 | (905) 432-8466 |
| National Defence 53 Simcoe St N, Oshawa L1G 4R9 | (905) 721-4000 |
| Canada Human Resource Ctr 78 Richmond St W, Oshawa L1G 1E1 | (905) 725-6319 |
| Canada Mortgage & Housing Corp 419 King St W #100, Oshawa L1J 2K5 | (905) 721-5115 |