Area Code 605-589 located in SPRINGFIELD, BON HOMME, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 589 City : SPRINGFIELD County : BON HOMME State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46009 LATA (Local Access Transport Area) : 640 Rate Center : TYNDALL ZIP Code Count : 23 ZIP Code Frequency : 3 ZIP Code : 57062 Other Information NPANXX : 605589 County Population : 0 Switch CLLI (Common Language Location Identifier) : TYNDSDXARS1 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : FORT RANDALL TELCO DBA MT RUSHMORE TELEPHONE CO OCN (Operating Company Number) : 1660 Coverage Area Name : TYNDALL Latitude : 42.9939 Longitude : -97.8696 ‹ previous : 605-588 next › : 605-589 Telephone Number List 605-589-0000 ~ 605-589-9999