ZIP Code 21720 is located in the county of Washington in the state of Maryland. 21720 ZIP Code is spread between the coordinates of +39.65 Latitude and -77.57 Longitude. 21720 ZIP Code is part of the 240 area code. There are 0 postal offices in zip code 21720.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 21720. Always when you mail a package or a letter, be attentive to mention the preferred or acceptable cities. Using any city in the list of unacceptable cities may result in unforseen delays.