Sunderland MD ZIP Code
Sunderland city is located in Maryland State, Calvert County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Sunderland MD zip code by its streets and block numbers if we have some of the Sunderland streets loaded in our website
Sunderland Area Code is 443/410 and Time Zone is Eastern (GMT -05:00).
Sunderland Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Sunderland City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Sunderland ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Sunderland, Maryland.
The Sunderland Zip Code is 20689.
If you want to send a mail to Sunderland City, you should use the 20689 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Sunderland 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 20689 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Sunderland 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.