Frederick MD ZIP Code
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Frederick 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 Frederick MD zip code by its streets and block numbers if we have some of the Frederick streets loaded in our website
Frederick Area Code is 301/240 and Time Zone is Eastern (GMT -05:00).
Frederick Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Frederick City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Frederick ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Frederick, Maryland.
The Frederick Zip Code is 21701, 21702, 21703, 21704, 21705, 21709.
If you want to send a mail to Frederick City, you should use the 21701, 21702, 21703, 21704, 21705, 21709 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Frederick 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 21701, 21702, 21703, 21704, 21705, 21709 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Frederick 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.