Baltimore County Maryland is covered by a total of 67 ZIP Codes. There are 24 ZIP Codes in Baltimore County that extend into adjacent counties (Baltimore City County, Carroll County, Harford County, and Howard County). Of the ZIP codes within or partially within Baltimore County there are 47 Standard ZIP Codes, 6 Unique ZIP Codes and 14 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 Baltimore County and can be turned on and off. Each type of postal code can also be turned on and off.