| Subdistrict | Enum. district | # of links |
| Chatham Township | 16 | 212 |
| Chatham | 47 | 11 |
| Chatham | 9 | 11 |
| Wallaceburg | 45 | 10 |
| Wallaceburg | 46 | 10 |
| Chatham | 11 | 9 |
| Chatham | 7 | 6 |
| Chatham | 17 | 6 |
| Dawn | 1 | 6 |
| Wallaceburg | 47 | 5 |
| Camden Township | 2 | 5 |
| Chatham | 52 | 3 |
| Sarnia | 46 | 3 |
| Townships 6 | 13 | 3 |
| Dresden | 39 | 3 |
| Camden | 4 | 2 |
| Township 31 in range 17 west of the 2nd M | 113 | 1 |
| Chatham | 51 | 1 |
| Harwich | 11 | 1 |
| Township 19 in ranges 25 | 7 | 1 |
| Chatham | 14 | 1 |
| Brandon | 50 | 1 |
| Townships 34 | 14 | 1 |
| Sombra | 36 | 1 |
| Dawn | 7 | 1 |
| Dresden | 38 | 1 |
| Bayham | 2 | 1 |
| Chatham | 12 | 1 |
| Chatham | 55 | 1 |