Rocky Ridge MD ZIP Code
Rocky Ridge 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 Rocky Ridge MD zip code by its streets and block numbers if we have some of the Rocky Ridge streets loaded in our website
Rocky Ridge Area Code is 240/301 and Time Zone is Eastern (GMT -05:00).
Rocky Ridge Zip Code - Maryland
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Rocky Ridge City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Rocky Ridge ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Rocky Ridge, Maryland.
The Rocky Ridge Zip Code is 21778.
If you want to send a mail to Rocky Ridge City, you should use the 21778 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Rocky Ridge 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 21778 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Rocky Ridge 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.