Area Code 203-312 located in NEW FAIRFIELD, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 312 City : NEW FAIRFIELD County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1995-02-11 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : DANBURY ZIP Code Count : 435 ZIP Code Frequency : 83 ZIP Code : 06812 Other Information NPANXX : 203312 County Population : 0 Switch CLLI (Common Language Location Identifier) : NWFLCT00RS0 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 : DANBURY Latitude : 41.4586 Longitude : -73.4736 ‹ previous : 203-312 next › : 203-313 Telephone Number List 203-312-0000 ~ 203-312-9999