Wellesley Island, New York Zip Codes
📍 Wellesley Island is in Jefferson County, New York with 1 zip code; the most populous is 13640.
Wellesley Island is a USPS city name in Jefferson County, New York with a Census population of approximately 305 across its ZIP codes. Jefferson County as a whole has 42 ZIP codes in this directory. Below you'll find every zip code serving Wellesley Island 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 Wellesley Island Zip Codes
Wellesley Island at a Glance
Wellesley Island has 1 ZIP code in this directory: 1 standard delivery ZIP. Its one ZIP with published Census housing data, 13640, has 305 residents.
Wellesley Island's ZIP has a household income of $92,422 and a home value of $330,500, a price-to-income ratio of 3.6, above the 2.9 New York ZIP median.
100% of households in Wellesley Island own their home (statewide ZIP median 80%). 59% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 3.8%, far below the 9.9% statewide ZIP median. Overall density is about 25 residents per square mile across 12 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.
Wellesley Island Zip Code Map
Interactive map of Wellesley Island, New York zip codes. Click any marker for details.