Area Code 203-453 located in GUILFORD, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 453 City : GUILFORD County : NEW HAVEN State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 09009 LATA (Local Access Transport Area) : 920 Rate Center : GUILFORD ZIP Code Count : 3863 ZIP Code Frequency : 99 ZIP Code : 06437 Other Information NPANXX : 203453 County Population : 0 Switch CLLI (Common Language Location Identifier) : GUFDCT00DS0 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 : GUILFORD Latitude : 41.2841 Longitude : -72.6821 ‹ previous : 203-452 next › : 203-454 Telephone Number List 203-453-0000 ~ 203-453-9999