ZIP Code 21778
Rocky Ridge, Maryland · Frederick County
No9189
Zip21778
TypeSTANDARD
Decommissioned0
Primary CityRocky Ridge
Acceptable Cities—
Unacceptable Cities—
StateMD
LstateMaryland
CountyFrederick County
TimezoneAmerica/New_York
Area Codes227, 240, 301, 410, 443, 667
World RegionNA
CountryUS
Latitude39,61
Longitude-77,33