Jefferson County New York is covered by a total of 45 ZIP Codes. There are 10 ZIP Codes in Jefferson County that extend into adjacent counties (Herkimer County, Lewis County, Oswego County, and Saint Lawrence County). Of the ZIP codes within or partially within Jefferson County there are 33 Standard ZIP Codes and 12 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Jefferson County and can be turned on and off. Each type of postal code can also be turned on and off.