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Clark County, Idaho facts for kids

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Clark County
Aquilegia at Nez Perce National Historic Trail.
Official seal of Clark County
Map of Idaho highlighting Clark 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 1, 1919
Named for Sam K. Clark,
state senator & pioneer
Seat Dubois
Largest city Dubois
 • Total 1,765 sq mi (4,570 km2)
 • Land 1,764 sq mi (4,570 km2)
 • Water 1.0 sq mi (3 km2)  0.1%
 • Total 790 Decrease
 • Density 0.56/sq mi (0.22/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district 2nd

Clark County is a rural county in the U.S. state of Idaho; its county seat and largest city is Dubois. As of the 2020 Census, the county had a population of 790, making it the least populous county in the state.


Establishment of stage coach stops along the route between Salt Lake City and the Montana mines were established at Beaver Canyon and Dry Creek (now Dubois) in 1864. Originally part of Alturas County, both locations were transferred to Oneida County in 1877. They became part of Bingham County at its creation in 1885. Clark County was also the site of the Battle of Camas Creek during the Nez Perce War which occurred at Camas Meadows near Kilgore on August 20, 1872. The Utah and Northern Railway reached Beaver Canyon in 1879. By the 1890 Census, Beaver Canyon had a population of 216. The settlement relocated to Spencer in 1897.

The majority of Clark County was transferred to Fremont County when it was created in 1893 with the remaining territory being transferred in 1896. By the 1900 Census, 1,199 residents lived in the five precincts of Birch Creek, Dubois, Kilgore, Medicine Lodge, and Spencer. At the 1910 census, the precincts contained 1,095 residents.

Dry Creek was renamed Dubois in 1892 and incorporated prior to 1920 while Spencer was incorporated in 1947.

The county was established 104 years ago in 1919, partitioned from Fremont County by the state legislature; the county division bill was signed by Governor D. W. Davis on February 1. It was named for state senator Sam K. Clark, an early pioneer on Medicine Lodge Creek in the upper Snake River valley.


According to the U.S. Census Bureau, the county has a total area of 1,765 square miles (4,570 km2), of which 1,764 square miles (4,570 km2) is land and 1.0 square mile (2.6 km2) (0.1%) is water.

The northern border of the county is the Bitterroot Range of the Rocky Mountains, which forms the state line with Montana and is also the continental divide. It is crossed by Interstate 15 over Monida Pass at 6,820 feet (2,080 m) above sea level. Monida Pass also marks an east-west divide between Bitterroot subranges: the Beaverhead Mountains are to the west and the Centennial Mountains are to the east.

Adjacent counties

Major highways

National protected areas


Historical population
Census Pop.
1920 1,886
1930 1,122 −40.5%
1940 1,005 −10.4%
1950 918 −8.7%
1960 915 −0.3%
1970 741 −19.0%
1980 798 7.7%
1990 762 −4.5%
2000 1,022 34.1%
2010 982 −3.9%
2020 790 −19.6%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020

2010 census

As of the 2010 United States Census, there were 982 people, 345 households, and 243 families living in the county. The population density was 0.6 inhabitants per square mile (0.23/km2). There were 531 housing units at an average density of 0.3 per square mile (0.12/km2). The racial makeup of the county was 72.4% white, 1.0% American Indian, 0.7% black or African American, 0.5% Asian, 23.8% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 40.5% of the population. In terms of ancestry, 14.8% were English, 7.4% were German, and 6.5% were American.

Of the 345 households, 37.7% had children under the age of 18 living with them, 57.4% were married couples living together, 7.0% had a female householder with no husband present, 29.6% were non-families, and 24.3% of all households were made up of individuals. The average household size was 2.84 and the average family size was 3.41. The median age was 32.7 years.

The median income for a household in the county was $40,909 and the median income for a family was $37,656. Males had a median income of $32,895 versus $24,125 for females. The per capita income for the county was $19,737. About 8.7% of families and 11.3% of the population were below the poverty line, including 21.5% of those under age 18 and 5.9% of those age 65 or over.



Unincorporated communities


The public schools in the county are operated by Clark County School District #161, headquartered in Dubois. Clark County High School competes in athletics in the Rocky Mountain Conference in IHSAA 1A Division II; the school colors are orange and black and its mascot is a bobcat.

See also

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

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