| Locality | Post Code |
|---|---|
| Allanburg, Niagara | L0S 1A0 |
| Beamsville, Niagara | L0R |
| Caistor Centre, Niagara | L0R |
| Campden, Niagara | L0R 1G0 |
| Crystal Beach, Niagara | L0S 1B0, L0S 1B0, L0S … |
| Fenwick, Niagara | L0S |
| Fonthill, Niagara | L0S |
| Fort Erie, Niagara | L2A |
| Grassie, Niagara | L0R 1M0 |
| Grimsby, Niagara | L3M |
| Jordan Station, Niagara | L0R |
| Niagara Falls, Niagara | L2E, L2G, L2H, L2J |
| Niagara on the Lake, Niagara | L0S |
| Port Colborne, Niagara | L3K |
| Port Robinson, Niagara | L0S |
| Queenston, Niagara | L0S 1L0, L0S 0A9 |
| Ridgeville, Niagara | L0S |
| Ridgeway, Niagara | L0S |
| Saint Anns, Niagara | L0R 1Y0 |
| Saint Catharines, Niagara | L2M, L2N, L2P, L2R, L2S, … |
| Saint Davids, Niagara | L0S |
| Sherkston, Niagara | L0S 1R0 |
| Smithville, Niagara | L0R |
| Stevensville, Niagara | L0S |
| Thorold, Niagara | L2V |
| Vineland, Niagara | L0R 2C0 |