| Subdistrict | Enum. district | # of links |
| Dawn | 8 | 117 |
| Sombra | 37 | 13 |
| Sarnia | 44 | 7 |
| Wallaceburg | 45 | 7 |
| Chatham | 9 | 7 |
| Bothwell | 36 | 7 |
| Sarnia | 45 | 5 |
| Dawn | 11 | 5 |
| Moore | 16 | 5 |
| Enniskillen | 23 | 5 |
| Sarnia | 46 | 5 |
| Chatham | 12 | 4 |
| Houghton | 10 | 4 |
| Zone | 34 | 4 |
| Dawn | 5 | 4 |
| Dawn | 1 | 3 |
| Sarnia | 47 | 3 |
| Camden | 4 | 3 |
| Townships 22 | 36 | 3 |
| Enniskillen | 20 | 3 |
| Oil Springs | 65 | 2 |
| Sombra | 40 | 2 |
| Petrolia | 55 | 2 |
| Moore | 20 | 2 |
| Dresden | 38 | 2 |
| Sarnia | 51 | 2 |
| Township 29 in ranges 1 | 17 | 2 |
| Dawn | 4 | 1 |
| Westminster Township | 23 | 1 |
| Dawn | 3 | 1 |
| Moore | 13 | 1 |
| Wallaceburg | 46 | 1 |
| Moore | 17 | 1 |
| Sarnia | 53 | 1 |
| Moore | 15 | 1 |