Ada County Idaho is covered by a total of 37 ZIP Codes. There are 8 ZIP Codes in Ada County that extend into adjacent counties (Boise County, Canyon County, Elmore County, Gem County, and Owyhee County). Of the ZIP codes within or partially within Ada County there are 18 Standard ZIP Codes, 10 Unique ZIP Codes and 8 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 Ada County and can be turned on and off. Each type of postal code can also be turned on and off.