| Locality | Post Code |
|---|---|
| Maple View, Oswego | 13107 |
| Mexico, Oswego | 13114 |
| Minetto, Oswego | 13115 |
| New Haven, Oswego | 13121 |
| North Hannibal, Oswego | 13126 |
| Orwell, Oswego | 13426 |
| Oswego, Oswego | 13126 |
| Palermo, Oswego | 13069 |
| Parish, Oswego | 13131 |
| Pennellville, Oswego | 13132 |
| Phoenix, Oswego | 13135 |
| Pine Meadows, Oswego | 13302 |
| Port Ontario, Oswego | 13142 |
| Pulaski, Oswego | 13142 |
| Redfield, Oswego | 13437 |
| Ricard, Oswego | 13302 |
| Richland, Oswego | 13144 |
| Sandy Creek, Oswego | 13145 |
| Schroeppel, Oswego | 13135 |
| Scriba, Oswego | 13126 |
| Seneca Hill, Oswego | 13126 |
| Smartville, Oswego | 13083 |
| South Albion, Oswego | 13302 |
| South Hannibal, Oswego | 13074 |
| Southwest Oswego, Oswego | 13126 |
| Volney, Oswego | 13069 |