ZIP Code 21723 is located in the county of Howard in the state of Maryland. 21723 ZIP Code is spread between the coordinates of +39.3247095 Latitude and -77.00967216 Longitude. 21723 ZIP Code is part of the 410 area code. There are 0 postal offices in zip code 21723.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 21723. 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.