ZIP Code 21792
Unionville, Maryland · Frederick County
No9200
Zip21792
TypePO BOX
Decommissioned0
Primary CityUnionville
Acceptable Cities—
Unacceptable Cities—
StateMD
LstateMaryland
CountyFrederick County
TimezoneAmerica/New_York
Area Codes240
World RegionNA
CountryUS
Latitude39,51
Longitude-77,11