About this number
(712) 257 is a landline based telephone number operated by Northwest Iowa Telephone, LLC and is located in zip code 51054 in the city of Sergeant Bluff, Iowa, which is in Woodbury County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 712 and Network Numbering Exchange (NXX - also known as a prefix) of 257. It has an Operating Company Number (OCN) of 1260. A Common Language Location Identifier (CLLI) of SRBLIAXODS0. As well as a Local access and transport area (LATA) of 630. Zip code 51054 has a population of 5,110 as of the 2010 census.