Glen Arm MD ZIP Code
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Glen Arm city is located in Maryland State, Baltimore County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Glen Arm MD zip code by its streets and block numbers if we have some of the Glen Arm streets loaded in our website
Glen Arm Area Code is 410/443 and Time Zone is Eastern (GMT -05:00).
Glen Arm Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Glen Arm City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Glen Arm ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Glen Arm, Maryland.
The Glen Arm Zip Code is 21057.
If you want to send a mail to Glen Arm City, you should use the 21057 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Glen Arm ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 21057 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Glen Arm city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in Maryland.