Area Code 605-857 located in YANKTON, YANKTON, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 857 City : YANKTON County : YANKTON State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 2002-05-01 FIPS (Federal Information Processing Standards) : 46135 LATA (Local Access Transport Area) : 640 Rate Center : YANKTON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 57078 Other Information NPANXX : 605857 Switch CLLI (Common Language Location Identifier) : YNTNSDABCM6 MSA CBSA (Core Based Statistical Area) : Yankton, SD MSA CBSA Code (Core Based Statistical Area) : 49460 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 : YANKTON Latitude : 42.8755 Longitude : -97.3931 ‹ previous : 605-856 next › : 605-858 Telephone Number List 605-857-0000 ~ 605-857-9999