| Subdistrict | Enum. district | # of links |
| Oil Springs | 64 | 159 |
| Petrolia | 55 | 11 |
| Oil Springs | 65 | 7 |
| Dresden | 39 | 5 |
| Enniskillen | 20 | 5 |
| Petrolia | 56 | 5 |
| Moore | 17 | 4 |
| Enniskillen | 33 | 3 |
| Camden | 5 | 3 |
| Wallaceburg | 47 | 2 |
| Petrolia | 53 | 2 |
| Bosanquet | 6 | 2 |
| Courtright | 54 | 2 |
| Petrolia | 59 | 2 |
| Dawn | 2 | 1 |
| Sarnia | 46 | 1 |
| Enniskillen | 31 | 1 |
| Camden Township | 2 | 1 |
| Warwick | 42 | 1 |
| Township 3 in ranges 16 | 48 | 1 |
| McGillivray | 15 | 1 |
| Petrolia | 57 | 1 |
| Berlin | 35 | 1 |