Area Code 605-233 located in CLARK, CLARK, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 233 City : CLARK County : CLARK State : SD (South Dakota) NXX Use Type : Wireless NXX Intro Version : 2004-01-27 FIPS (Federal Information Processing Standards) : 46025 LATA (Local Access Transport Area) : 640 Rate Center : CLARK ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 57225 Other Information NPANXX : 605233 County Population : 0 Switch CLLI (Common Language Location Identifier) : CLRKSDAC0MD 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 : CLARK Latitude : 44.8733 Longitude : -97.7344 ‹ previous : 605-232 next › : 605-234 Telephone Number List 605-233-0000 ~ 605-233-9999