| Subdistrict | Enum. district | # of links |
| Chatham | 11 | 178 |
| Wallaceburg | 46 | 14 |
| Chatham | 12 | 12 |
| Wallaceburg | 45 | 10 |
| Dresden | 40 | 9 |
| Sarnia | 44 | 9 |
| Chatham | 10 | 7 |
| Chatham Township | 16 | 7 |
| Townships 18 | 19 | 7 |
| Camden | 4 | 7 |
| Calgary | 48 | 5 |
| Township 19 in ranges 25 | 7 | 4 |
| Sombra | 41 | 4 |
| Sombra | 35 | 4 |
| Sombra | 38 | 4 |
| Wallaceburg | 47 | 3 |
| Dresden | 39 | 2 |
| Chatham | 47 | 2 |
| Chesley | 53 | 1 |
| Camden Township | 3 | 1 |
| Chatham | 46 | 1 |
| Pelee | 58 | 1 |
| Camden | 6 | 1 |
| Halifax | 49 | 1 |
| Sarnia | 30 | 1 |