Preston MD ZIP Code
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Preston city is located in Maryland State, Caroline County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Preston MD zip code by its streets and block numbers if we have some of the Preston streets loaded in our website
Preston Area Code is 410 and Time Zone is Eastern (GMT -05:00).
Preston Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Preston City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Preston ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Preston, Maryland.
The Preston Zip Code is 21655.
If you want to send a mail to Preston City, you should use the 21655 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Preston 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 21655 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Preston 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.