Bonneville County is a county located in the state of Idaho. As of the 2010 census, the county had a population of 104,234. making it
the fourth-most populous county in Idaho and the most populous in eastern Idaho. Its county seat and largest city is Idaho Falls. Bonneville
County was established in 1911 and named after Benjamin Bonneville (1796–1878), a French-born officer in the U.S. Army, fur trapper, and
explorer in the American West.
Bonneville County is part of the Idaho Falls, ID Metropolitan Statistical Area.
Bonneville County is named for Captain Benjamin Louis Eulalie de Bonneville, a French-born United States Army officer who explored the area in the 1830s.
County QuickFacts: Census Bureau Quick Facts
Established February 7, 1911 by the state legislature from the north and east parts of Bingham County. Named for Captain B. L. E. Bonneville, of the U. S. Army, who explored throughout the Snake River area in the 1830s. A settlement developed at the site of 1864, this settlement was known as Idaho Falls after 1891.
According to the US Census Bureau, the county has a total area of 1,901 square miles (4,920 km2), of which 1,866 square miles (4,830 km2) is land and 35 square miles (91 km2) (1.8%) is water. The Snake River flows northwest through the Bonneville County, beginning at the Wyoming border as the Palisades Reservoir. The river exits the county about midway on its northern border, turns and re-enters approximately 20 miles (32 km) west to flow southwest through Idaho Falls .
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