Area Code 203-720 located in BEACON FALLS, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 720 City : BEACON FALLS 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 : NAUGATUCK ZIP Code Count : 183 ZIP Code Frequency : 12 ZIP Code : 06403 Other Information NPANXX : 203720 County Population : 0 Switch CLLI (Common Language Location Identifier) : NGTCCT00DS0 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 : NAUGATUCK Latitude : 41.4931 Longitude : -73.0517 ‹ previous : 203-719 next › : 203-720 Telephone Number List 203-720-0000 ~ 203-720-9999