Area Code 203-858 located in WESTPORT, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 858 City : WESTPORT County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : NORWALK ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 06880 Other Information NPANXX : 203858 County Population : 0 Switch CLLI (Common Language Location Identifier) : WLFRCTAICM5 MSA CBSA (Core Based Statistical Area) : Bridgeport-Stamford-Norwalk, CT MSA CBSA Code (Core Based Statistical Area) : 14860 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT OCN (Operating Company Number) : 6388 Coverage Area Name : NORWALK Latitude : 41.1003 Longitude : -73.4187 ‹ previous : 203-857 next › : 203-859 Telephone Number List 203-858-0000 ~ 203-858-9999