• Source: Twin Falls County, Idaho

Twin Falls County is a county in the south central part of the U.S. state of Idaho. As of the 2020 census, the population was 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.




Geography


According to the United States 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

=
Gooding County - north
Jerome County - northeast
Cassia County - east
Elko County, Nevada - south/Pacific Time Border
Owyhee County - west
Elmore County - northwest




= Major highways

=
US 30
US 93
SH-50
SH-74




= National protected areas

=
Hagerman Fossil Beds National Monument
Sawtooth National Forest (part)




Demographics






= 2010 census

=
As of the 2010 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.




= 2000 census

=
As of the 2000 census, there were 64,284 people, 23,853 households, and 16,959 families living in the county. The population density was 33 inhabitants per square mile (13/km2). There were 25,595 housing units at an average density of 13 per square mile (5.0/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.
There were 23,853 households, out of which 34.70% had children under the age of 18 living with them, 58.00% were married couples living together, 9.20% had a female householder with no husband present, and 28.90% were non-families. 23.60% of all households were made up of individuals, and 10.40% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.13.
In the county, the population was spread out, with 27.90% under the age of 18, 10.40% from 18 to 24, 26.00% from 25 to 44, 21.50% from 45 to 64, and 14.30% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 96.50 males. For every 100 females age 18 and over, there were 93.70 males.
The median income for a household in the county was $34,506, and the median income for a family was $39,886. Males had a median income of $30,058 versus $20,825 for females. The per capita income for the county was $16,678. About 9.10% of families and 12.70% of the population were below the poverty line, including 16.00% of those under age 18 and 9.30% of those age 65 or over.




Communities






Politics


Twin Falls County leans heavily Republican; it has not voted for a Democratic presidential nominee since 1936, and even in the Democratic landslide of 1964 Barry Goldwater still carried Twin Falls by 20 percentage points.




Education


School districts include:

Bliss Joint School District 234
Buhl Joint School District 412
Cassia County Joint School District 151
Castleford School District 417
Filer School District 413
Hagerman Joint School District 233
Hansen School District 415
Kimberly School District 414
Murtaugh Joint School District 418
Three Creek Joint Elementary School District 416
Twin Falls School District 411
The county is in the catchment area, and the taxation zone, for College of Southern Idaho.




See also


National Register of Historic Places listings in Twin Falls County, Idaho




Notes






References






External links


County website
County Parcel Map

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