Area Code 605-203 located in ERWIN, KINGSBURY, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 203 City : ERWIN County : KINGSBURY State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 2003-02-09 FIPS (Federal Information Processing Standards) : 46077 LATA (Local Access Transport Area) : 640 Rate Center : LK PRESTON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 57233 Other Information NPANXX : 605203 County Population : 0 Switch CLLI (Common Language Location Identifier) : HURNSDGCCM1 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - IL OCN (Operating Company Number) : 6534 Coverage Area Name : LAKE PRESTON Latitude : 44.3694 Longitude : -97.3759 ‹ previous : 605-202 next › : 605-204 Telephone Number List 605-203-0000 ~ 605-203-9999