About this number
(605) 668 is a landline based telephone number operated by Qwest Corporation and is located in zip code 57078 in the city of Yankton, South Dakota, which is in Yankton County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 605 and Network Numbering Exchange (NXX - also known as a prefix) of 668. It has an Operating Company Number (OCN) of 9631. A Common Language Location Identifier (CLLI) of YNTNSDCODS1. As well as a Local access and transport area (LATA) of 640. Zip code 57078 has a population of 19,121 as of the 2010 census.