11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 13045 | Cortland | 28,157 |
| 13077 | Homer | 6,646 |
| 13803 | Marathon | 4,278 |
| 13040 | Cincinnatus | 2,620 |
| 13101 | McGraw | 2,410 |
| 13158 | Truxton | 1,352 |
| 13141 | Preble | 655 |
| 13863 | Willet | 473 |
| 13784 | Harford | 294 |
| 13087 | Little York | 161 |
| 13738 | Blodgett Mills | 44 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Cortland County, New York (US Census).