Area Code 712-551 located in HAWARDEN, SIOUX, IA, more detail is as below. Place NPA (Numbering Plan Area) : 712 NXX (Local Number Prefix) : 551 City : HAWARDEN County : SIOUX State : IA (Iowa) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 19167 LATA (Local Access Transport Area) : 630 Rate Center : HAWARDEN ZIP Code Count : 1060 ZIP Code Frequency : 100 ZIP Code : 51023 Other Information NPANXX : 712551 Switch CLLI (Common Language Location Identifier) : HWRDIAADRS0 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : HAWARDEN MUNICIPAL UTILITIES OCN (Operating Company Number) : 8708 Coverage Area Name : HAWARDEN Latitude : 42.9988 Longitude : -96.4833 ‹ previous : 712-550 next › : 712-552 Telephone Number List 712-551-0000 ~ 712-551-9999