Gibson Island MD ZIP Code
Gibson Island city is located in Maryland State, Anne Arundel County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Gibson Island MD zip code by its streets and block numbers if we have some of the Gibson Island streets loaded in our website
Gibson Island Area Code is 410 and Time Zone is Eastern (GMT -05:00).
Gibson Island Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Gibson Island City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Gibson Island ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Gibson Island, Maryland.
The Gibson Island Zip Code is 21056.
If you want to send a mail to Gibson Island City, you should use the 21056 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Gibson Island 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 21056 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Gibson Island 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.