Area Code 605-599 located in IROQUOIS, KINGSBURY, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 599 City : IROQUOIS County : KINGSBURY State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46077 LATA (Local Access Transport Area) : 640 Rate Center : CAVOUR ZIP Code Count : 32 ZIP Code Frequency : 13 ZIP Code : 57353 Other Information NPANXX : 605599 County Population : 0 Switch CLLI (Common Language Location Identifier) : CAVRSDCORS1 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : QWEST CORPORATION OCN (Operating Company Number) : 9631 Coverage Area Name : CAVOUR Latitude : 44.3680 Longitude : -98.0361 ‹ previous : 605-599 next › : 605-599 Telephone Number List 605-599-0000 ~ 605-599-9999