Area Code 203-277 located in OLD GREENWICH, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 277 City : OLD GREENWICH County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 2003-08-31 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : OLDGRNWICH ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06870 Other Information NPANXX : 203277 County Population : 0 Switch CLLI (Common Language Location Identifier) : SMFRCTDSDS0 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 : BROOKS FIBER COMMUNICATIONS OF CONNECTICUT INC-CT OCN (Operating Company Number) : 7230 Coverage Area Name : OLD GREENWICH Latitude : 41.0302 Longitude : -73.5668 ‹ previous : 203-276 next › : 203-278 Telephone Number List 203-277-0000 ~ 203-277-9999