Area Code 203-517 located in STAMFORD, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 517 City : STAMFORD County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1999-10-13 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : STAMFORD ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06906 Other Information NPANXX : 203517 County Population : 0 Switch CLLI (Common Language Location Identifier) : SMFRCTPUDS0 MSA CBSA (Core Based Statistical Area) : Bridgeport-Stamford-Norwalk, CT MSA CBSA Code (Core Based Statistical Area) : 14860 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : LEVEL 3 COMMUNICATIONS, LLC - CT OCN (Operating Company Number) : 4800 Coverage Area Name : STAMFORD Latitude : 41.0473 Longitude : -73.5264 ‹ previous : 203-516 next › : 203-517 Telephone Number List 203-517-0000 ~ 203-517-9999