Frederick County Maryland is covered by a total of 37 ZIP Codes. There are 10 ZIP Codes in Frederick County that extend into adjacent counties (Carroll County, Howard County, Montgomery County, and Washington County). Of the ZIP codes within or partially within Frederick County there are 30 Standard ZIP Codes, 1 Unique ZIP Codes and 6 PO Box ZIP Codes. Data Updated September 15, 2024
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 Frederick County and can be turned on and off. Each type of postal code can also be turned on and off.