Area Code 203-774 located in WALLINGFORD, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 774 City : WALLINGFORD County : NEW HAVEN State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 2000-08-20 FIPS (Federal Information Processing Standards) : 09009 LATA (Local Access Transport Area) : 920 Rate Center : WALLINGFD ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06492 Other Information NPANXX : 203774 County Population : 0 Switch CLLI (Common Language Location Identifier) : HRFRCT0370Z 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 : CHOICE ONE COMMUNICATIONS, INC. - CT OCN (Operating Company Number) : 2706 Coverage Area Name : WALLINGFORD Latitude : 41.4539 Longitude : -72.8137 ‹ previous : 203-773 next › : 203-775 Telephone Number List 203-774-0000 ~ 203-774-9999