Area Code 203-400 located in TRUMBULL, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 400 City : TRUMBULL County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Wireless NXX Intro Version : 2002-08-04 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : TRUMBULL ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06611 Other Information NPANXX : 203400 County Population : 0 Switch CLLI (Common Language Location Identifier) : BRPTCT04CM3 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 : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : TRUMBULL Latitude : 41.2626 Longitude : -73.2211 ‹ previous : 203-399 next › : 203-401 Telephone Number List 203-400-0000 ~ 203-400-9999