Area Code 443-203 located in WEST RIVER, ANNE ARUNDEL, MD, more detail is as below. Place NPA (Numbering Plan Area) : 443 NXX (Local Number Prefix) : 203 City : WEST RIVER County : ANNE ARUNDEL State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2001-03-03 FIPS (Federal Information Processing Standards) : 24003 LATA (Local Access Transport Area) : 238 Rate Center : WEST RIVER ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20778 Other Information NPANXX : 443203 County Population : 0 Switch CLLI (Common Language Location Identifier) : MAYOMDMYRS1 MSA CBSA (Core Based Statistical Area) : Baltimore-Towson, MD MSA CBSA Code (Core Based Statistical Area) : 12580 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Overlay : L Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : WEST RIVER Latitude : 38.8522 Longitude : -76.6013 ‹ previous : 443-202 next › : 443-204 Telephone Number List 443-203-0000 ~ 443-203-9999