Area Code 203-479 located in NEW HAVEN, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 479 City : NEW HAVEN County : NEW HAVEN State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1995-02-11 FIPS (Federal Information Processing Standards) : 09009 LATA (Local Access Transport Area) : 920 Rate Center : NEW HAVEN ZIP Code Count : 2 ZIP Code Frequency : 2 ZIP Code : 06501 Other Information NPANXX : 203479 County Population : 0 Switch CLLI (Common Language Location Identifier) : WSHNCT00DS0 MSA CBSA (Core Based Statistical Area) : New Haven-Milford, CT MSA CBSA Code (Core Based Statistical Area) : 35300 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 : NEW HAVEN Latitude : 41.2698 Longitude : -72.9439 ‹ previous : 203-477 next › : 203-479 Telephone Number List 203-479-0000 ~ 203-479-9999