Area Code 203-580 located in WATERBURY, NEW HAVEN, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 580 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) : 132 Rate Center : WATERBURY ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06708 Other Information NPANXX : 203580 County Population : 0 Switch CLLI (Common Language Location Identifier) : WTRBCT0004T 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 : PEERLESS NETWORK OF CONNECTICUT, LLC - CT OCN (Operating Company Number) : 539F Coverage Area Name : GREENWICH Latitude : 41.0152 Longitude : -73.6508 ‹ previous : 203-580 next › : 203-581 Telephone Number List 203-580-0000 ~ 203-580-9999