Area Code 605-483 located in MADISON, LAKE, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 483 City : MADISON County : LAKE State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46079 LATA (Local Access Transport Area) : 640 Rate Center : WENTWORTH ZIP Code Count : 24 ZIP Code Frequency : 6 ZIP Code : 57042 Other Information NPANXX : 605483 County Population : 0 Switch CLLI (Common Language Location Identifier) : WNWOSDXARS4 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : INTERSTATE TELECOM. COOP., INC. - SOUTH DAKOTA OCN (Operating Company Number) : 1651 Coverage Area Name : WENTWORTH Latitude : 43.9958 Longitude : -96.9649 ‹ previous : 605-482 next › : 605-483 Telephone Number List 605-483-0000 ~ 605-483-9999