Great Mills MD ZIP Code
Great Mills city is located in Maryland State, Saint Marys County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Great Mills MD zip code by its streets and block numbers if we have some of the Great Mills streets loaded in our website
Great Mills Area Code is 240/301 and Time Zone is Eastern (GMT -05:00).
Great Mills Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Great Mills City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Great Mills ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Great Mills, Maryland.
The Great Mills Zip Code is 20634.
If you want to send a mail to Great Mills City, you should use the 20634 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Great Mills 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 20634 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Great Mills 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.