Area Code 203-409 located in OLD GREENWICH, FAIRFIELD, CT, more detail is as below. Place NPA (Numbering Plan Area) : 203 NXX (Local Number Prefix) : 409 City : OLD GREENWICH County : FAIRFIELD State : CT (Connecticut) NXX Use Type : Landline NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 09001 LATA (Local Access Transport Area) : 920 Rate Center : OLDGRNWICH ZIP Code Count : 2 ZIP Code Frequency : 100 ZIP Code : 06870 Other Information NPANXX : 203409 County Population : 0 Switch CLLI (Common Language Location Identifier) : HRFRCTCRDS0 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 - NEW YORK - CT OCN (Operating Company Number) : 7143 Coverage Area Name : OLD GREENWICH Latitude : 41.0302 Longitude : -73.5668 ‹ previous : 203-408 next › : 203-410 Telephone Number List 203-409-0000 ~ 203-409-9999