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Idaho CountiesThere are44 Counties in Idaho.
Counties are the largest political divisions within the state.
When Idaho became a territory in March, 1863, there were four Counties in existence: Boise, Idaho, Nez Perce and
Shoshone. By the time Idaho became a state 27 years later, there were 15 counties. The rest of the 44 Counties came into existence during the 30 years after Idaho became a state. Two of the former Counties disappeared
during this time. Alturas, which was created in 1864, was later divided into the many Counties now found in
central Idaho. Logan County was only in existence for six years, from 1889 to 1895. It was combined with Alturas
to form Blaine County and Lincoln County, which was formed just two weeks after Logan lost its identity.
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Jefferson County, Idaho
Jefferson County Education, Geography, and History
Jefferson County is a county located in the state of Idaho. As of the 2010 census, the population was 26,140. The county seat and
largest city is Rigby. The county was established in 1913 and named after Thomas Jefferson, the third U.S. President.
Jefferson County is part of the Idaho Falls, ID Metropolitan Statistical Area.
Etymology - Origin of Jefferson County Name
Jefferson County is named for Thomas Jefferson (1743-1826), President of the United States from 1801 to
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Jefferson County History
Established February 18, 1913 with its county seat at Rigby. Named for Thomas Jefferson, third president of the
United States. The first settlers were Mormons who constructed irrigation systems.
According to the US Census Bureau, the county has a total area of 1,106 square miles (2,860 km2), of which 1,094 square miles (2,830 km2)
is land and 12 square miles (31 km2) (1.1%) is water
- North: Clark County
- Northeast: Fremont County
- East: Madison County
- Southeast: Bonneville County
- South: Bingham County
- West: Butte County
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