| Subdistrict | Enum. district | # of links |
| Plympton | 22 | 358 |
| Plympton | 28 | 10 |
| Sarnia | 46 | 9 |
| Plummer | 11 | 7 |
| Plympton | 25 | 7 |
| Townships 39 | 53 | 5 |
| Township 24 in ranges 22 | 51 | 5 |
| Toronto | 139 | 4 |
| Forest | 50 | 4 |
| Forest | 51 | 3 |
| Plympton | 26 | 3 |
| Petrolia | 52 | 2 |
| Sarnia | 29 | 2 |
| Sarnia | 51 | 2 |
| Point Edward | 60 | 2 |
| Chatham Township | 16 | 1 |
| Gosfield South | 18 | 1 |
| Steelton | 16 | 1 |
| Petrolia | 58 | 1 |
| Sarnia | 44 | 1 |
| Adelaide | 1 | 1 |
| Plympton | 21 | 1 |
| Sarnia | 50 | 1 |
| Sarnia | 33 | 1 |
| Enniskillen | 20 | 1 |
| Forest | 49 | 1 |
| Township 40 in ranges 1 | 54 | 1 |
| Plympton | 27 | 1 |
| Wallaceburg | 46 | 1 |