Area Code 712-228 located in SERGEANT BLUFF, WOODBURY, IA, more detail is as below. Place NPA (Numbering Plan Area) : 712 NXX (Local Number Prefix) : 228 City : SERGEANT BLUFF County : WOODBURY State : IA (Iowa) NXX Use Type : Landline NXX Intro Version : 2003-02-09 FIPS (Federal Information Processing Standards) : 19193 LATA (Local Access Transport Area) : 630 Rate Center : SERGENTBLF ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 51054 Other Information NPANXX : 712228 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 : NORTHWEST IOWA TELEPHONE, LLC OCN (Operating Company Number) : 1260 Coverage Area Name : SERGEANT BLUFF Latitude : 42.4001 Longitude : -96.3582 ‹ previous : 712-227 next › : 712-229 Telephone Number List 712-228-0000 ~ 712-228-9999