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Cassia County, Idaho facts for kids

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Cassia County
Cassia County Courthouse
Cassia County Courthouse
Official seal of Cassia County
Map of Idaho highlighting Cassia 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 20, 1879
Named for Cassia Creek
Seat Burley
Largest city Burley
 • Total 2,580 sq mi (6,700 km2)
 • Land 2,565 sq mi (6,640 km2)
 • Water 15 sq mi (40 km2)  0.6%
 • Total 24,655 Increase
 • Density 9.6/sq mi (3.7/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district 2nd

Cassia County is a county in the U.S. state of Idaho. As of the 2010 Census the county had a population of 22,952. The county seat and largest city is Burley. Cassia County is included in the Burley, ID Micropolitan Statistical Area.


The first Europeans explored the Milner area in Cassia County in 1911. It was trappers who initially developed the Oregon Trail, which ran on the county's northern border. The Raft River's junction with the Oregon Trail marked the split for the California Trail. While the Oregon and California trails brought hundreds of thousands of emigrants through Cassia County, it also brought settlers. A Stage line through the county was established between Kelton, Utah and Boise, Idaho in 1869. A stage station existed at City of Rocks. Additional stations were spaced at increments of 10-12 miles between stations to include one at Oakley Meadows, located in the Goose Creek valley two miles west of the present settlement of Oakley. William Oakley settled at the Oakley Meadows station in 1870. Cattle operations also developed starting in 1872. Settlement commenced at nearby Albion in 1873 with significant Mormon settlement there starting in 1875. By 1880, Albion contained a population of 257. Mormon settlement at Oakley also commenced June 1, 1878 when four Mormon men each staked out 160 acres for their settlement. Settlements remained primarily agricultural with more than 38,000 head of cattle located in the area by 1885. Settlement at Malta occurred prior to 1890, as the Malta precinct was enumerated with 172 residents at the 1890 census. Albion State Normal School was established at Albion in 1893. The school was focused on training Idaho teachers until 1951 when its programs were transferred to Idaho State College (now Idaho State University) in Pocatello.

Burley was platted and settled in 1905 after a branch of the Oregon Shortline was constructed through the town. Declo was settled under the name of Marshfield by 1909.

Cassia County was created from [[Owyhee County, Idaho|Owyhee County on February 20, 1879 with Albion becoming the county seat. A western portion became Twin Falls County in 1907. The county assumed its present boundaries when an eastern portion became Power County on January 30, 1913. The county seat was moved to Burley in 1918. The county was named for Cassia Creek, which in turn was named either for John Cazier, a member of the Mormon Battalion and an emigrant train captain, or for a plant found in the area.


According to the U.S. Census Bureau, the county has a total area of 2,580 square miles (6,700 km2), of which 2,565 square miles (6,640 km2) is land and 15 square miles (39 km2) (0.6%) is water. The county's highest point is Cache Peak at an elevation of 10,339 feet (3,151 m) above sea level in the Albion Mountains, and the lowest is Milner Lake, a reservoir on the Snake River, at 4,134 feet (1,260 m).

The northern half of the county is part of the Magic Valley region of the Snake River Plain, and numerous mountain ranges extend north from the southern boundary and diminish as they approach the river, which flows from east to west.

The Silent City of Rocks National Reserve, containing exposed granitic batholith as old as 2.5 billion years, is located in the southern part of the county.

Adjacent Counties


National protected areas


Historical population
Census Pop.
1880 1,312
1890 3,143 139.6%
1900 3,951 25.7%
1910 7,197 82.2%
1920 15,659 117.6%
1930 13,116 −16.2%
1940 14,430 10.0%
1950 14,629 1.4%
1960 16,121 10.2%
1970 17,017 5.6%
1980 19,427 14.2%
1990 19,532 0.5%
2000 21,416 9.6%
2010 22,952 7.2%
2020 24,655 7.4%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020 2020

2010 census

As of the 2010 United States Census, there were 22,952 people, 7,666 households, and 5,758 families living in the county. The population density was 8.9 inhabitants per square mile (3.4/km2). There were 8,372 housing units at an average density of 3.3 per square mile (1.3/km2). The racial makeup of the county was 81.8% white, 0.8% American Indian, 0.5% Asian, 0.3% black or African American, 0.1% Pacific islander, 14.2% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 24.9% of the population. In terms of ancestry, 22.3% were English, 11.8% were German, 10.6% were American, and 5.1% were Irish.

Of the 7,666 households, 41.9% had children under the age of 18 living with them, 60.8% were married couples living together, 9.1% had a female householder with no husband present, 24.9% were non-families, and 21.5% of all households were made up of individuals. The average household size was 2.96 and the average family size was 3.46. The median age was 32.0 years.

The median income for a household in the county was $39,866 and the median income for a family was $47,995. Males had a median income of $36,402 versus $22,156 for females. The per capita income for the county was $17,782. About 12.4% of families and 15.4% of the population were below the poverty line, including 18.7% of those under age 18 and 8.1% of those age 65 or over.



Unincorporated communities


Cassia County is served primarily by one school district, Cassia Joint School District #151, which was consolidated in the 1950s.

Schools Located in Cassia County

High Schools

  • Burley High School in Burley
  • Cassia Alternative High School in Burley
  • Declo High School in Declo
  • Oakley High School in Oakley
  • Raft River High School in Malta

Jr. High Schools

  • Burley Jr. High School in Burley
  • Declo Jr. High School in Declo
  • Oakley Jr. High School in Oakley
  • Raft River Jr. High School in Malta

Elementary Schools

  • Albion Elementary School in Albion
  • Almo Elementary School in Almo
  • Declo Elementary in Declo
  • Dworshak Elementary School in Burley
  • Evans Elementary School in Burley
  • Mountain View Elementary School in Burley
  • Raft River Elementary School in Malta
  • White Pine Elementary School in Burley

See also

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

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