Area Code 317-571 located in WESTFIELD, HAMILTON, IN, more detail is as below. Place NPA (Numbering Plan Area) : 317 NXX (Local Number Prefix) : 571 City : WESTFIELD County : HAMILTON State : IN (Indiana) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 18057 LATA (Local Access Transport Area) : 336 Rate Center : CARMEL ZIP Code Count : 20 ZIP Code Frequency : 2 ZIP Code : 46074 Other Information NPANXX : 317571 County Population : 0 Switch CLLI (Common Language Location Identifier) : CRMLIN01DS0 MSA CBSA (Core Based Statistical Area) : Indianapolis-Carmel, IN MSA CBSA Code (Core Based Statistical Area) : 26900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : AMERITECH INDIANA OCN (Operating Company Number) : 9325 Coverage Area Name : CARMEL Latitude : 39.9425 Longitude : -86.1518 ‹ previous : 317-571 next › : 317-571 Telephone Number List 317-571-0000 ~ 317-571-9999