Loudoun County Virginia is covered by a total of 38 ZIP Codes. There are 7 ZIP Codes in Loudoun County that extend into adjacent counties (Clarke County, Fairfax County, Fauquier County, Jefferson County, and Montgomery County). Of the ZIP codes within or partially within Loudoun County there are 21 Standard ZIP Codes, 5 Unique ZIP Codes and 11 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 Loudoun County and can be turned on and off. Each type of postal code can also be turned on and off.