Area Code 605-242 located in NORTH SIOUX CITY, UNION, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 242 City : NORTH SIOUX CITY County : UNION State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 2000-06-13 FIPS (Federal Information Processing Standards) : 46127 LATA (Local Access Transport Area) : 630 Rate Center : NOSIOUX CY ZIP Code Count : 35 ZIP Code Frequency : 100 ZIP Code : 57049 Other Information NPANXX : 605242 County Population : 0 Switch CLLI (Common Language Location Identifier) : SRBLIAXODS0 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 : LONG LINES METRO, LLC - SD OCN (Operating Company Number) : 7010 Coverage Area Name : NORTH SIOUX CITY Latitude : 42.5177 Longitude : -96.4808 ‹ previous : 605-241 next › : 605-243 Telephone Number List 605-242-0000 ~ 605-242-9999