Area Code 712-722 located in ROCK VALLEY, SIOUX, IA, more detail is as below. Place NPA (Numbering Plan Area) : 712 NXX (Local Number Prefix) : 722 City : ROCK VALLEY County : SIOUX State : IA (Iowa) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 19167 LATA (Local Access Transport Area) : 630 Rate Center : SIOUX CTR ZIP Code Count : 71 ZIP Code Frequency : 2 ZIP Code : 51247 Other Information NPANXX : 712722 Switch CLLI (Common Language Location Identifier) : SXCTIAXODS0 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : MUTUAL TELEPHONE CO. OCN (Operating Company Number) : 1252 Coverage Area Name : SIOUX CENTER Latitude : 43.0757 Longitude : -96.1765 ‹ previous : 712-722 next › : 712-722 Telephone Number List 712-722-0000 ~ 712-722-9999