Jefferson County Colorado is covered by a total of 42 ZIP Codes. There are 17 ZIP Codes in Jefferson County that extend into adjacent counties (Adams County, Arapahoe County, Boulder County, Broomfield County, Clear Creek County, Denver County, Douglas County, Gilpin County, Park County, and Teller County). Of the ZIP codes within or partially within Jefferson County there are 30 Standard ZIP Codes, 1 Unique ZIP Codes and 10 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.