| Locality | Post Code |
|---|---|
| Alma, Wellington | N0B 1A0 |
| Ariss, Wellington | N0B |
| Arkell, Wellington | N0B 1C0 |
| Arthur, Wellington | N0G |
| Ballinafad, Wellington | N0B 0A2, N0B 1H0 |
| Belwood, Wellington | N0B |
| Churchill, Wellington | L0L 1K0 |
| Clifford, Wellington | N0G |
| Conn, Wellington | N0G 1N0 |
| Drayton, Wellington | N0G |
| Eden Mills, Wellington | N0B 1P0 |
| Elora, Wellington | N0B |
| Erin, Wellington | N0B |
| Fergus, Wellington | N1M |
| Guelph, Wellington | N1C, N1E, N1G, N1H, N1K, … |
| Harriston, Wellington | N0G |
| Hillsburgh, Wellington | N0B |
| Kenilworth, Wellington | N0G |
| Moorefield, Wellington | N0G |
| Morriston, Wellington | N0B 2C0 |
| Palmerston, Wellington | N0G |
| Puslinch, Wellington | N0B |
| Rockwood, Wellington | N0B |
| Township of Wilmot, Wellington | N0B 2H1 |