Area Code 605-478 located in HIGHMORE, HYDE, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 478 City : HIGHMORE County : HYDE State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 2005-06-25 FIPS (Federal Information Processing Standards) : 46069 LATA (Local Access Transport Area) : 640 Rate Center : HIGHMORE ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 57345 Other Information NPANXX : 605478 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 : HIGHMORE Latitude : 44.5172 Longitude : -99.4528 ‹ previous : 605-477 next › : 605-479 Telephone Number List 605-478-0000 ~ 605-478-9999