| Locality | Post Code |
|---|---|
| Altmar, Oswego | 13302 |
| Bernhards Bay, Oswego | 13028 |
| Bowens Corners, Oswego | 13069 |
| Boylston, Oswego | 13083 |
| Bundyville, Oswego | 13126 |
| Central Square, Oswego | 13036 |
| Cleveland, Oswego | 13042 |
| Colosse, Oswego | 13131 |
| Constantia, Oswego | 13044 |
| Demster, Oswego | 13126 |
| Fairdale, Oswego | 13074 |
| Fernwood, Oswego | 13142 |
| Fruit Valley, Oswego | 13126 |
| Fulton, Oswego | 13069 |
| Furniss, Oswego | 13126 |
| Furniss Station, Oswego | 13126 |
| Gayville, Oswego | 13044 |
| Granby, Oswego | 13069 |
| Hannibal, Oswego | 13074 |
| Hastings, Oswego | 13076 |
| Hinmansville, Oswego | 13135 |
| Howardville, Oswego | 13302 |
| Kasoag, Oswego | 13302 |
| Lacona, Oswego | 13083 |
| Lycoming, Oswego | 13093 |
| Mallory, Oswego | 13103 |