Williamstown, New York Zip Codes
📍 Williamstown is in Oswego County, New York with 1 zip code; the most populous is 13493.
Williamstown is a USPS city name in Oswego County, New York with a Census population of approximately 2,355 across its ZIP codes. Oswego County as a whole has 27 ZIP codes in this directory. Below you'll find every zip code serving Williamstown 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 Williamstown Zip Codes
Williamstown at a Glance
Williamstown has 1 ZIP code in this directory: 1 standard delivery ZIP. Its one ZIP with published Census housing data, 13493, has 2,355 residents.
Williamstown's ZIP has a household income of $60,735 and a home value of $109,700, a price-to-income ratio of 1.8, below the 2.9 New York ZIP median. Median rent across these ZIPs is $909 a month.
84% of households in Williamstown own their home (statewide ZIP median 80%). 13% of adults hold a bachelor's degree, far below the 31% statewide median. The median poverty rate is 19.8%, far above the 9.9% statewide ZIP median. Overall density is about 33 residents per square mile across 71 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.
Williamstown Zip Code Map
Interactive map of Williamstown, New York zip codes. Click any marker for details.