Jefferson County, Idaho

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Jefferson County is a county located in the U.S. state of Idaho. The county was established in 1913, and was named after Thomas Jefferson, the third U.S. President.[1] As of the 2000 Census the county had a population of 19,155 (2008 estimate: 23,860).[2] The county seat and largest city is Rigby.[3] Jefferson County is part of the Idaho Falls, ID, Metropolitan Statistical Area.



According to the United States Census Bureau, the county has a total area of 1,106 square miles (2,864.5 km2), of which 1,095 square miles (2,836.0 km2) is land and 10 square miles (25.9 km2) (0.95%) is water.

Adjacent counties

National protected area


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