| Business | Phone |
| Ontario Employment Supports 150 Christina St N, Sarnia N7T 7W5 | (519) 337-3735 |
| Legal Aid 201 Front St N, Sarnia N7T 7T9 | (519) 336-9371 |
| Motor Vehicle Licence Bureau 556 Christina St N, Sarnia N7T 5W6 | (519) 344-7715 |
| Ontario Civil Filing Office 700 Christina St N, Sarnia N7V 3C2 | (519) 337-5314 |
| Ontario Correctional Svc 720 Christina St N, Sarnia N7V 3C2 | (519) 337-2365 |
| Ontario Crown Attorney 700 Christina St N, Sarnia N7V 3C2 | (519) 337-7596 |
| Ontario Driver Examination 1362 Lambton Mall Rd, Sarnia N7S 5A1 | (519) 542-7707 |
| Ontario Enforcement Office 700 Christina St N, Sarnia N7V 3C2 | (519) 337-8940 |
| Ontario Environment 1094 London Rd, Sarnia N7S 1P1 | (519) 336-4030 |
| Ontario Health Insurance 452 Christina St N, Sarnia N7T 5W4 | (519) 337-2348 |
| Ontario Land Registry Office 700 Christina St N, Sarnia N7V 3C2 | (519) 337-2393 |
| Ontario Small Claims Court 700 Christina St N, Sarnia N7V 3C2 | (519) 337-7964 |
| Ontario Sarnia Jail 700 Christina St N, Sarnia N7V 3C2 | (519) 337-3261 |
| Caroline Di Cocco Constituency 150 Christina St N, Sarnia N7T 7W5 | (519) 337-0051 |