ZIP Code 20621 is located in the county of St. Mary's in the state of Maryland. 20621 ZIP Code is spread between the coordinates of +38.3245991 Latitude and -76.80256396 Longitude. 20621 ZIP Code is part of the 301 area code. There is 1 postal office in zip code 20621.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 20621. 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.