Area Code 605-232 located in JEFFERSON, UNION, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 232 City : JEFFERSON County : UNION State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 46127 LATA (Local Access Transport Area) : 630 Rate Center : NOSIOUX CY ZIP Code Count : 71 ZIP Code Frequency : 5 ZIP Code : 57038 Other Information NPANXX : 605232 County Population : 0 Switch CLLI (Common Language Location Identifier) : SXCYIADTDS1 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 : QWEST CORPORATION OCN (Operating Company Number) : 9631 Coverage Area Name : NORTH SIOUX CITY Latitude : 42.4992 Longitude : -96.4038 ‹ previous : 605-231 next › : 605-232 Telephone Number List 605-232-0000 ~ 605-232-9999