Area Code 203-813 located in GREENWICH, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 813 City : GREENWICH County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 2000-01-14 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 132 Rate Center : BYRAM ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 06831 Other Information NPANXX : 203813 County Population : 0 Switch CLLI (Common Language Location Identifier) : WHPLNY02DS5 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 : TELEPORT COMMUNICATIONS GROUP - NY OCN (Operating Company Number) : 7140 Coverage Area Name : GREENWICH Latitude : 41.0357 Longitude : -73.7674 ‹ previous : 203-813 next › : 203-814 Telephone Number List 203-813-0000 ~ 203-813-9999