| Subdistrict | Enum. district | # of links |
| Courtright | 54 | 144 |
| Moore | 14 | 78 |
| Moore | 12 | 17 |
| Moore | 17 | 13 |
| Plympton | 24 | 6 |
| Sombra | 43 | 6 |
| Sarnia | 49 | 6 |
| Glencoe | 36 | 4 |
| Sombra | 38 | 3 |
| Port Dover | 52 | 3 |
| Petrolia | 56 | 3 |
| Point Edward | 60 | 3 |
| Sarnia | 44 | 2 |
| Moore | 16 | 2 |
| Toronto | 16 | 2 |
| Alvinston | 62 | 2 |
| Moore | 19 | 2 |
| Woodhouse | 43 | 1 |
| Petrolia | 52 | 1 |
| Sarnia | 30 | 1 |
| Sarnia | 53 | 1 |
| Enniskillen | 25 | 1 |
| London | 23 | 1 |
| Sarnia | 29 | 1 |