Area Code 203-670 located in WATERBURY, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 670 City : WATERBURY County : NEW HAVEN State : CT (Connecticut) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 09009 LATA (Local Access Transport Area) : 920 Rate Center : WATERBURY ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06710 Other Information NPANXX : 203670 County Population : 0 Switch CLLI (Common Language Location Identifier) : SOBYCTPZCM0 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 : AMERICAN MESSAGING (AM), INC. OCN (Operating Company Number) : 9748 Coverage Area Name : WATERBURY Latitude : 41.5522 Longitude : -73.0443 ‹ previous : 203-669 next › : 203-670 Telephone Number List 203-670-0000 ~ 203-670-9999