ZIP Code 21139
Riderwood, Maryland · Baltimore County
No8946
Zip21139
TypePO BOX
Decommissioned0
Primary CityRiderwood
Acceptable Cities—
Unacceptable Cities—
StateMD
LstateMaryland
CountyBaltimore County
TimezoneAmerica/New_York
Area Codes410
World RegionNA
CountryUS
Latitude39,4
Longitude-76,6