Area Code 605-966 located in ELK POINT, UNION, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 966 City : ELK POINT County : UNION State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46127 LATA (Local Access Transport Area) : 640 Rate Center : JEFFERSON ZIP Code Count : 23 ZIP Code Frequency : 5 ZIP Code : 57025 Other Information NPANXX : 605966 Switch CLLI (Common Language Location Identifier) : JFSNSDXADS1 MSA CBSA (Core Based Statistical Area) : Sioux City, IA-NE-SD MSA CBSA Code (Core Based Statistical Area) : 43580 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : JEFFERSON TELEPHONE CO. OCN (Operating Company Number) : 1666 Coverage Area Name : JEFFERSON Latitude : 42.6023 Longitude : -96.5615 ‹ previous : 605-965 next › : 605-966 Telephone Number List 605-966-0000 ~ 605-966-9999