Area Code 605-994 located in FREDERICK, BROWN, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 994 City : FREDERICK County : BROWN State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46013 LATA (Local Access Transport Area) : 640 Rate Center : HECLA ZIP Code Count : 32 ZIP Code Frequency : 10 ZIP Code : 57441 Other Information NPANXX : 605994 Switch CLLI (Common Language Location Identifier) : HECLSDXARS3 MSA CBSA (Core Based Statistical Area) : Aberdeen, SD MSA CBSA Code (Core Based Statistical Area) : 10100 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : JAMES VALLEY COOPERATIVE TELEPHONE COMPANY OCN (Operating Company Number) : 1664 Coverage Area Name : HECLA Latitude : 45.8814 Longitude : -98.1494 ‹ previous : 605-994 next › : 605-994 Telephone Number List 605-994-0000 ~ 605-994-9999