Area Code 301-812 located in OWINGS, CALVERT, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 812 City : OWINGS County : CALVERT State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1996-07-01 FIPS (Federal Information Processing Standards) : 24009 LATA (Local Access Transport Area) : 238 Rate Center : WSNG238Z15 ZIP Code Count : 153 ZIP Code Frequency : 16 ZIP Code : 20736 Other Information NPANXX : 301812 County Population : 0 Switch CLLI (Common Language Location Identifier) : NRBHMDNEDS0 MSA CBSA (Core Based Statistical Area) : Washington-Arlington-Alexandria, DC-VA-MD-WV MSA CBSA Code (Core Based Statistical Area) : 47900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : NORTH BEACH Latitude : 38.7046 Longitude : -76.5761 ‹ previous : 301-812 next › : 301-812 Telephone Number List 301-812-0000 ~ 301-812-9999