Marathon, New York Zip Codes
📍 Marathon is in Cortland County, New York with 1 zip code; the most populous is 13803.
Marathon is a USPS city name in Cortland County, New York with a Census population of approximately 3,936 across its ZIP codes. Cortland County as a whole has 12 ZIP codes in this directory. Below you'll find every zip code serving Marathon with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Marathon Zip Codes
Marathon at a Glance
Marathon has 1 ZIP code in this directory: 1 standard delivery ZIP. Its one ZIP with published Census housing data, 13803, has 3,936 residents.
Marathon's ZIP has a household income of $62,537 and a home value of $134,300, a price-to-income ratio of 2.1, below the 2.9 New York ZIP median. Median rent across these ZIPs is $798 a month.
84% of households in Marathon own their home (statewide ZIP median 80%). 14% of adults hold a bachelor's degree, far below the 31% statewide median. The median poverty rate is 14.1%, above the 9.9% statewide ZIP median. Overall density is about 42 residents per square mile across 94 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 New York ZIP Code Affordability Report.
Marathon Zip Code Map
Interactive map of Marathon, New York zip codes. Click any marker for details.