Glenwood MD ZIP Code
Glenwood city is located in Maryland State, Howard County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Glenwood MD zip code by its streets and block numbers if we have some of the Glenwood streets loaded in our website
Glenwood Area Code is 443/410 and Time Zone is Eastern (GMT -05:00).
Glenwood Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Glenwood City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Glenwood ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Glenwood, Maryland.
The Glenwood Zip Code is 21738.
If you want to send a mail to Glenwood City, you should use the 21738 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Glenwood 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 21738 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Glenwood 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.