There are 11 zip codes in Cortland County, New York. The most populated is 13045, located in Cortland. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
13045Cortland28,157
13077Homer6,646
13803Marathon4,278
13040Cincinnatus2,620
13101McGraw2,410
13158Truxton1,352
13141Preble655
13863Willet473
13784Harford294
13087Little York161
13738Blodgett Mills44

Cortland County, New York Zip Codes by Population (2024)