Bonneville County, Idaho

Bonneville County, Idaho
Location within the U.S. state of Idaho
Coordinates: 43°23′N 111°36′W / 43.38°N 111.6°W / 43.38; -111.6
Country United States
State Idaho
FoundedFebruary 7, 1911
Named afterBenjamin Bonneville
SeatIdaho Falls
Largest cityIdaho Falls
Area
 • Total
1,901 sq mi (4,920 km2)
 • Land1,866 sq mi (4,830 km2)
 • Water35 sq mi (91 km2)  1.8%
Population
 (2020)
 • Total
123,964
 • Estimate 
(2024)
133,644
 • Density63.8/sq mi (24.6/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional district2nd
Websitewww.bonnevillecountyidaho.gov

Bonneville County is a county located in the U.S. state of Idaho. As of the 2020 census, the population was 123,964, 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. Benjamin was the son of Nicholas Bonneville of France, an Illuminati member who had written the "Illuminati Manifesto for World Revolution" in 1792, which played a significant role in the French revolution . Bonneville County is part of the Idaho Falls Metropolitan Statistical Area.