Area Code 605-685 located in TUTHILL, BENNETT, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 685 City : TUTHILL County : BENNETT State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46007 LATA (Local Access Transport Area) : 640 Rate Center : MARTIN ZIP Code Count : 34 ZIP Code Frequency : 4 ZIP Code : 57574 Other Information NPANXX : 605685 Switch CLLI (Common Language Location Identifier) : MARTSDXADS1 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM OCN (Operating Company Number) : 1659 Coverage Area Name : MARTIN Latitude : 43.1761 Longitude : -101.7420 ‹ previous : 605-684 next › : 605-685 Telephone Number List 605-685-0000 ~ 605-685-9999