Area Code 605-538 located in CHERRY CREEK, ZIEBACH, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 538 City : CHERRY CREEK County : ZIEBACH State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46137 LATA (Local Access Transport Area) : 640 Rate Center : DUPREE ZIP Code Count : 6 ZIP Code Frequency : 3 ZIP Code : 57622 Other Information NPANXX : 605538 County Population : 0 Switch CLLI (Common Language Location Identifier) : DUPRSDXB538 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : CHEYENNE RIVER SIOUX TRIBAL TELEPHONE AUTH. OCN (Operating Company Number) : 1647 Coverage Area Name : DUPREE Latitude : 45.0475 Longitude : -101.6107 ‹ previous : 605-537 next › : 605-538 Telephone Number List 605-538-0000 ~ 605-538-9999