Twin Falls County, Idaho
| Twin Falls County, Idaho | ||
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 Location in the U.S. state of Idaho |
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 Idaho's location in the U.S. |
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| Founded | February 21, 1907 | |
| Named for | Snake River waterfall | |
| Seat | Twin Falls | |
| Largest city | Twin Falls | |
| Area | ||
| • Total | 1,928 sq mi (4,993 km2) | |
| • Land | 1,921 sq mi (4,975 km2) | |
| • Water | 7.1 sq mi (18 km2), 0.4% | |
| Population (est.) | ||
| • (2016) | 83,514 | |
| • Density | 40/sq mi (15/km²) | |
| Congressional district | 2nd | |
| Time zone | Mountain: UTC-7/-6 | |
| Website | www |
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Twin Falls County is a county in the south central part of the U.S. state of Idaho. As of the 2010 Census, the county had a population of 77,230. The county seat and largest city is Twin Falls.
Twin Falls County is part of the Twin Falls, ID Micropolitan Statistical Area.
Prior to the 1860s, the Twin Falls County area was an unorganized part of Shoshone lands, then as part of the Oregon Country. The area was first organized as part of the original Owyhee County in 1864 as part of Idaho Territory. In 1879 it was partitioned away from Owyhee County to form part of Cassia County. The county is named for a split waterfall on the Snake River of the same name. The Snake River is the county's northern boundary.
Even after Idaho became a state in 1890, the Twin Falls area was very sparsely populated and without significant settlements. That changed after the city of Twin Falls was founded in 1904 and Milner Dam was completed in 1905. Most of the county's other towns were established during this period as well. In response to local government needs for these new communities, which were as much as 80 miles (130 km) away from Cassia County's seat at Albion, Twin Falls County was created by the Idaho Legislature on February 21, 1907.
According to the U.S. Census Bureau, the county has a total area of 1,928 square miles (4,990 km2), of which 1,921 square miles (4,980 km2) is land and 7.1 square miles (18 km2) (0.4%) is water.
As of the census of 2000, there were 64,284 people, 23,853 households, and 16,959 families residing in the county. The population density was 33 people per square mile (13/km²). There were 25,595 housing units at an average density of 13 per square mile (5/km²). The racial makeup of the county was 92.47% White, 0.19% Black or African American, 0.71% Native American, 0.76% Asian, 0.08% Pacific Islander, 3.77% from other races, and 2.02% from two or more races. 9.37% of the population were Hispanic or Latino of any race. 17.9% were of German, 17.7% English, 10.9% American and 7.3% Irish ancestry according to Census 2000.
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