| Subdistrict | Enum. district | # of links |
| Plympton | 21 | 185 |
| Forest | 51 | 17 |
| Forest | 49 | 9 |
| Forest | 50 | 7 |
| Plympton | 23 | 5 |
| London | 11 | 5 |
| Township 14 in ranges 19 | 32 | 4 |
| Oil Springs | 64 | 4 |
| Plympton | 24 | 3 |
| Townships 14 | 90 | 3 |
| Petrolia | 58 | 2 |
| Petrolia | 53 | 1 |
| Stouffville | 36 | 1 |
| Sarnia | 53 | 1 |
| London | 5 | 1 |
| Wyoming | 57 | 1 |
| Petrolia | 56 | 1 |