11 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 13045 | Cortland | 28,388 |
| 13077 | Homer | 6,567 |
| 13803 | Marathon | 3,936 |
| 13040 | Cincinnatus | 2,683 |
| 13101 | McGraw | 2,221 |
| 13158 | Truxton | 1,377 |
| 13141 | Preble | 643 |
| 13863 | Willet | 430 |
| 13784 | Harford | 383 |
| 13087 | Little York | 252 |
| 13738 | Blodgett Mills | 22 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Cortland County, New York (US Census).