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Bonneville County, in southeast Idaho, is part of the Upper Snake River Valley. Its eastern border is also the state border of Idaho and Wyoming. Idaho Falls, originally called Eagle Rock, is the county seat. Incorporated cities in Bonneville County include Ammon, Idaho Falls, Iona, Irwin, Swan Valley, and Ucon. Bonneville is the fourth largest county in the state with a population of more than 104,000.

 

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Bonneville County

605 N Capital Ave
Idaho Falls, ID, 83402
Phone: (208) 529-1350