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Power County, Idaho facts for kids

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Power County
Power County Courthouse, American Falls
Power County Courthouse, American Falls
Official seal of Power County
Map of Idaho highlighting Power 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 January 30, 1913
Named for power plant at the American Falls Dam
Seat American Falls
Largest city American Falls
 • Total 1,443 sq mi (3,740 km2)
 • Land 1,404 sq mi (3,640 km2)
 • Water 38 sq mi (100 km2)  2.7%
 • Total 7,878
 • Density 5.4595/sq mi (2.1079/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district 2nd

Power County is a county located in the U.S. state of Idaho. As of the 2010 Census, the county had a population of 7,817. The county seat and largest city is American Falls. The county was created by the Idaho Legislature on January 30, 1913, by a partition of Cassia County. It is named for an early hydroelectric power plant (1902) at the American Falls.


According to the U.S. Census Bureau, the county has a total area of 1,443 square miles (3,740 km2), of which 1,404 square miles (3,640 km2) is land and 38 square miles (98 km2) (2.7%) is water.

Adjacent counties

Major highways

National protected areas


Historical population
Census Pop.
1920 5,105
1930 4,457 −12.7%
1940 3,965 −11.0%
1950 3,988 0.6%
1960 4,111 3.1%
1970 4,864 18.3%
1980 6,844 40.7%
1990 7,086 3.5%
2000 7,538 6.4%
2010 7,817 3.7%
2020 7,878 0.8%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020 2020

2010 census

As of the 2010 United States Census, there were 7,817 people, 2,641 households, and 2,019 families living in the county. The population density was 5.6 inhabitants per square mile (2.2/km2). There were 2,944 housing units at an average density of 2.1 per square mile (0.81/km2). The racial makeup of the county was 75.1% white, 2.3% American Indian, 0.4% Asian, 0.3% black or African American, 0.1% Pacific islander, 19.5% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 29.8% of the population. In terms of ancestry, 16.7% were German, 16.7% were English, and 7.2% were American.

Of the 2,641 households, 40.7% had children under the age of 18 living with them, 60.6% were married couples living together, 10.1% had a female householder with no husband present, 23.6% were non-families, and 19.8% of all households were made up of individuals. The average household size was 2.94 and the average family size was 3.39. The median age was 33.2 years.

The median income for a household in the county was $40,843 and the median income for a family was $46,391. Males had a median income of $35,674 versus $29,844 for females. The per capita income for the county was $18,412. About 8.3% of families and 11.1% of the population were below the poverty line, including 13.7% of those under age 18 and 12.3% of those age 65 or over.



Census-designated place

Unincorporated communities

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