ZIP Code 21001 is located in the county of Harford in the state of Maryland. 21001 ZIP Code is spread between the coordinates of +39.5096708 Latitude and -76.18371187 Longitude. 21001 ZIP Code is part of the 410, 443, 667 area code. There are 0 postal offices in zip code 21001.
On the below highlighted section you can find the cities which the US Post Office accepts for ZIP code 21001. 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.