Area Code 605-231 located in SIOUX FALLS, MINNEHAHA, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 231 City : SIOUX FALLS County : MINNEHAHA State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 2001-10-31 FIPS (Federal Information Processing Standards) : 46099 LATA (Local Access Transport Area) : 640 Rate Center : SIOUX FLS ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 57103 Other Information NPANXX : 605231 County Population : 0 Switch CLLI (Common Language Location Identifier) : SXFLSDCH6MD MSA CBSA (Core Based Statistical Area) : Sioux Falls, SD MSA CBSA Code (Core Based Statistical Area) : 43620 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : BROOKINGS MUNICIPAL UTILITIES OCN (Operating Company Number) : 6982 Coverage Area Name : SIOUX FALLS Latitude : 43.5409 Longitude : -96.7263 ‹ previous : 605-230 next › : 605-231 Telephone Number List 605-231-0000 ~ 605-231-9999