Knoxville MD ZIP Code
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Knoxville 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 Knoxville MD zip code by its streets and block numbers if we have some of the Knoxville streets loaded in our website
Knoxville Area Code is 301 and Time Zone is Eastern (GMT -05:00).
Knoxville Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Knoxville City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Knoxville ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Knoxville, Maryland.
The Knoxville Zip Code is 21758.
If you want to send a mail to Knoxville City, you should use the 21758 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Knoxville 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 21758 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Knoxville 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.