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, making it the sixth most populous county in Idaho. The county seat and largest city is Twin Falls.
Twin Falls County is part of the Twin Falls, ID Twin Falls Metropolitan 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 2010 United States Census, there were 77,230 people, 28,760 households, and 19,954 families residing in the county. The population density was 40.2 inhabitants per square mile (15.5/km²). There were 31,072 housing units at an average density of 16.2 per square mile (6.3/km²). The racial makeup of the county was 88.9% white, 1.2% Asian, 0.8% American Indian, 0.4% black or African American, 0.1% Pacific islander, 6.3% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 13.7% of the population. In terms of ancestry, 20.2% were German, 14.5% were English, 10.8% were Irish, and 7.0% were American.
Of the 28,760 households, 35.4% had children under the age of 18 living with them, 54.1% were married couples living together, 10.5% had a female householder with no husband present, 30.6% were non-families, and 24.3% of all households were made up of individuals. The average household size was 2.65 and the average family size was 3.16. The median age was 34.4 years.
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