Area Code 203-420 located in RIDGEFIELD, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 420 City : RIDGEFIELD County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : MERIDEN ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 06877 Other Information NPANXX : 203420 County Population : 0 Switch CLLI (Common Language Location Identifier) : MRDNCT04RS0 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 : SOUTHERN NEW ENGLAND TELEPHONE CO. OCN (Operating Company Number) : 9147 Coverage Area Name : MERIDEN Latitude : 41.5005 Longitude : -72.7648 ‹ previous : 203-419 next › : 203-421 Telephone Number List 203-420-0000 ~ 203-420-9999