Area Code 605-235 located in NORTH SIOUX CITY, UNION, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 235 City : NORTH SIOUX CITY County : UNION State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 46127 LATA (Local Access Transport Area) : 630 Rate Center : NOSIOUX CY ZIP Code Count : 248 ZIP Code Frequency : 99 ZIP Code : 57049 Other Information NPANXX : 605235 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 : 605-234 next › : 605-236 Telephone Number List 605-235-0000 ~ 605-235-9999