Area Code 605-391 located in RAPID CITY, PENNINGTON, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 391 City : RAPID CITY County : PENNINGTON State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 1997-04-01 FIPS (Federal Information Processing Standards) : 46103 LATA (Local Access Transport Area) : 640 Rate Center : RAPID CITY ZIP Code Count : 3 ZIP Code Frequency : 38 ZIP Code : 57702 Other Information NPANXX : 605391 County Population : 0 Switch CLLI (Common Language Location Identifier) : RPCYSDWCCM3 MSA CBSA (Core Based Statistical Area) : Rapid City, SD MSA CBSA Code (Core Based Statistical Area) : 39660 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - IL OCN (Operating Company Number) : 6534 Coverage Area Name : RAPID CITY Latitude : 44.0863 Longitude : -103.2535 ‹ previous : 605-390 next › : 605-391 Telephone Number List 605-391-0000 ~ 605-391-9999