Area Code 605-365 located in DUPREE, ZIEBACH, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 365 City : DUPREE 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 : 322 ZIP Code Frequency : 99 ZIP Code : 57623 Other Information NPANXX : 605365 County Population : 0 Switch CLLI (Common Language Location Identifier) : DUPRSDXA365 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 : 45.0460 Longitude : -101.6046 ‹ previous : 605-364 next › : 605-366 Telephone Number List 605-365-0000 ~ 605-365-9999