Twin Falls is the county seat and largest city of Twin Falls County, Idaho, United States. The city had a population of 44,125 as of the 2010 census.Twin Falls is the largest city of Idaho's Magic Valley region. As the largest city in a 100-mile radius, Twin Falls serves as a regional commercial center for both south-central Idaho and northeastern Nevada.Twin Falls is the principal city of the Twin Falls, ID Twin Falls Metropolitan Statistical Area, which officially includes Jerome and Twin Falls County. The resort community of Jackpot, Nevada, in Elko County is unofficially considered part of the greater Twin Falls area.Located on a broad plain, Twin Falls is near the site where Evel Knievel attempted to jump across the Snake River Canyon in 1974 on a rocket-powered motorcycle.