| Localité | Code postal |
|---|---|
| Blodgett Mills, Cortland | 13738 |
| Cincinnatus, Cortland | 13040 |
| Cortland, Cortland | 13045 |
| Cortlandville, Cortland | 13045 |
| Cuyler, Cortland | 13158 |
| East Freetown, Cortland | 13040 |
| East Homer, Cortland | 13158 |
| Freetown, Cortland | 13803 |
| Freetown Corners, Cortland | 13803 |
| Galatia, Cortland | 13803 |
| Harford, Cortland | 13784 |
| Homer, Cortland | 13077 |
| Hunts Corners, Cortland | 13803 |
| Lapeer, Cortland | 13803 |
| Little York, Cortland | 13087 |
| Marathon, Cortland | 13803 |
| McGraw, Cortland | 13101 |
| Messengerville, Cortland | 13803 |
| Munsons Corners, Cortland | 13045 |
| Preble, Cortland | 13141 |
| Scott, Cortland | 13077 |
| Taylor, Cortland | 13040 |
| Texas Valley, Cortland | 13803 |
| Truxton, Cortland | 13158 |
| Virgil, Cortland | 13045 |
| Willet, Cortland | 13863 |