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Twin Falls County, Idaho facts for kids

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Twin Falls County
Oregon Trail Wayside in Hagerman Fossil Beds National Monument
Official seal of Twin Falls County
Map of Idaho highlighting Twin Falls County
Location within the U.S. state of Idaho
Map of the United States highlighting Idaho
Idaho's location within the U.S.
Country  United States
State  Idaho
Founded February 21, 1907
Named for Snake River waterfall
Seat Twin Falls
Largest city Twin Falls
 • Total 1,928 sq mi (4,990 km2)
 • Land 1,921 sq mi (4,980 km2)
 • Water 7.1 sq mi (18 km2)  0.4%
 • Total 90,046 Increase
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district 2nd

Twin Falls County is a county in the south central part of the U.S. state of Idaho. As of the 2020 Census, the county had a population of 90,046, making it the fifth-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.

Adjacent counties

Major highways

  • US 30.svg US 30
  • US 93.svg US 93
  • ID-50.svg SH-50
  • ID-74.svg SH-74

National protected areas


Historical population
Census Pop.
1910 13,543
1920 28,398 109.7%
1930 29,828 5.0%
1940 36,403 22.0%
1950 40,979 12.6%
1960 41,842 2.1%
1970 41,807 −0.1%
1980 52,927 26.6%
1990 53,580 1.2%
2000 64,284 20.0%
2010 77,230 20.1%
2020 90,046 16.6%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020 2020

2010 census

As of the 2010 United States Census, there were 77,230 people, 28,760 households, and 19,954 families living 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.

The median income for a household in the county was $42,455 and the median income for a family was $49,188. Males had a median income of $35,777 versus $26,257 for females. The per capita income for the county was $19,892. About 10.6% of families and 13.0% of the population were below the poverty line, including 16.9% of those under age 18 and 10.7% of those age 65 or over.


See also

Kids robot.svg In Spanish: Condado de Twin Falls (Idaho) para niños

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