| Subdistrict | Enum. district | # of links |
| Sombra | 35 | 149 |
| Sombra | 38 | 56 |
| Chatham | 11 | 14 |
| Wallaceburg | 47 | 12 |
| Sombra | 36 | 11 |
| Wallaceburg | 45 | 11 |
| Sombra | 43 | 9 |
| Chatham | 7 | 8 |
| Townships 21 | 16 | 7 |
| Township 3 in range 23 west of the 1st M | 28 | 7 |
| Moore | 17 | 7 |
| Point Edward | 60 | 7 |
| Sarnia | 30 | 7 |
| Enniskillen | 23 | 6 |
| Dryden | 74 | 6 |
| Camden | 4 | 5 |
| Mosa | 29 | 5 |
| Chatham | 17 | 5 |
| Sarnia | 44 | 5 |
| Sombra | 37 | 5 |
| Townships 20 | 22 | 5 |
| Wallaceburg | 46 | 5 |
| Township 10 in ranges 13 | 28 | 4 |
| Vankoughnet | 19 | 4 |
| Chatham Township | 16 | 4 |
| Dawn | 7 | 4 |
| Sombra | 39 | 4 |
| Chatham | 10 | 4 |
| Chatham | 49 | 3 |
| Townships 20 | 47 | 3 |
| Sarnia | 52 | 3 |
| Dresden | 40 | 3 |
| Sombra | 42 | 3 |
| Sombra | 41 | 3 |
| Townships 17 | 8 | 2 |
| Orford Township | 31 | 2 |
| Townships 18 | 23 | 2 |
| Dresden | 38 | 2 |
| Sarnia | 32 | 2 |
| Walpole Island Indian Reserve | 59 | 2 |
| Township 19 in ranges 25 | 7 | 2 |
| Townships 9 | 24 | 2 |
| Bothwell | 36 | 1 |
| Sarnia | 34 | 1 |
| London | 19 | 1 |
| Camden Township | 3 | 1 |
| Moore | 18 | 1 |
| Townships 25 | 108 | 1 |
| Dresden | 39 | 1 |
| Sarnia | 51 | 1 |
| Dawn | 1 | 1 |