Area Code 605-655 located in YANKTON, YANKTON, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 655 City : YANKTON County : YANKTON State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1999-02-27 FIPS (Federal Information Processing Standards) : 46135 LATA (Local Access Transport Area) : 640 Rate Center : YANKTON ZIP Code Count : 64 ZIP Code Frequency : 93 ZIP Code : 57078 Other Information NPANXX : 605655 Switch CLLI (Common Language Location Identifier) : YNTNSDCODS1 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 : QWEST CORPORATION OCN (Operating Company Number) : 9631 Coverage Area Name : YANKTON Latitude : 42.8858 Longitude : -97.3943 ‹ previous : 605-655 next › : 605-656 Telephone Number List 605-655-0000 ~ 605-655-9999