Monrovia MD ZIP Code
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Monrovia city is located in Maryland State, Frederick County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Monrovia MD zip code by its streets and block numbers if we have some of the Monrovia streets loaded in our website
Monrovia Area Code is 240/301 and Time Zone is Eastern (GMT -05:00).
Monrovia Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Monrovia City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Monrovia ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Monrovia, Maryland.
The Monrovia Zip Code is 21770.
If you want to send a mail to Monrovia City, you should use the 21770 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Monrovia 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 21770 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Monrovia 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.