Area Code 203-668 located in KILLINGWORTH, MIDDLESEX, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 668 City : KILLINGWORTH County : MIDDLESEX State : CT (Connecticut) NXX Use Type : Wireless NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 09007 LATA (Local Access Transport Area) : 920 Rate Center : NEW HAVEN ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 06419 Other Information NPANXX : 203668 County Population : 0 Switch CLLI (Common Language Location Identifier) : WLFRCTXBCM0 MSA CBSA (Core Based Statistical Area) : Hartford-West Hartford-East Hartford, CT MSA CBSA Code (Core Based Statistical Area) : 25540 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : SPRINT SPECTRUM L.P. OCN (Operating Company Number) : 6664 Coverage Area Name : NEW HAVEN Latitude : 41.3042 Longitude : -72.9236 ‹ previous : 203-667 next › : 203-669 Telephone Number List 203-668-0000 ~ 203-668-9999