ZIP Code 21738 is located in the county of Howard in the state of Maryland. 21738 ZIP Code is spread between the coordinates of +39.2789297 Latitude and -77.02338231 Longitude. 21738 ZIP Code is part of the 410, 443 area code. There is 1 postal office in zip code 21738.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 21738. 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.