Montgomery County Maryland is covered by a total of 82 ZIP Codes. There are 6 ZIP Codes in Montgomery County that extend into adjacent counties (Carroll County, Frederick County, Howard County, and Prince Georges County). Of the ZIP codes within or partially within Montgomery County there are 44 Standard ZIP Codes, 11 Unique ZIP Codes and 26 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 Montgomery County and can be turned on and off. Each type of postal code can also be turned on and off.