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Jefferson County, Idaho
Seal of Jefferson County, Idaho
Map of Idaho highlighting Jefferson County
Location in the state of Idaho
Map of the U.S. highlighting Idaho
Idaho's location in the U.S.
Founded February 18, 1913
Named for United States President Thomas Jefferson
Seat Rigby
 - Total
 - Land
 - Water

1,106 sq mi (2,863 km²)
1,096 sq mi (2,836 km²)
10 sq mi (27 km²), 0.95%
 - (2000)
 - Density


Jefferson County is a county located in the U.S. state of Idaho. The county was established in 1913. It was named after the United States President Thomas Jefferson. As of the 2000 Census the county had a population of 19,155 (2005 estimate: 21,580) [1]. The county seat is Rigby6.

Jefferson County is part of the Idaho Falls, ID Metropolitan Statistical Area.


According to the U.S. Census Bureau, the county has a total area of 2,863 km² (1,106 sq mi). 2,836 km² (1,095 sq mi) of it is land and 27 km² (10 sq mi) of it (0.95%) is water.

Adjacent Counties[]


As of the census2 of 2000, there were 19,155 people, 5,901 households, and 4,880 families residing in the county. The population density was 7/km² (18/sq mi). There were 6,287 housing units at an average density of 2/km² (6/sq mi). The racial makeup of the county was 90.87% White, 0.28% Black or African American, 0.46% Native American, 0.23% Asian, 0.08% Pacific Islander, 6.76% from other races, and 1.33% from two or more races. 9.96% of the population were Hispanic or Latino of any race.

There were 5,901 households out of which 47.60% had children under the age of 18 living with them, 72.60% were married couples living together, 6.80% had a female householder with no husband present, and 17.30% were non-families. 15.20% of all households were made up of individuals and 7.40% had someone living alone who was 65 years of age or older. The average household size was 3.23 and the average family size was 3.62.

In the county the population was spread out with 36.30% under the age of 18, 9.60% from 18 to 24, 25.50% from 25 to 44, 19.30% from 45 to 64, and 9.30% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 102.20 males. For every 100 females age 18 and over, there were 101.00 males.

The median income for a household in the county was $37,737, and the median income for a family was $41,530. Males had a median income of $31,298 versus $19,755 for females. The per capita income for the county was $13,838. About 8.00% of families and 10.40% of the population were below the poverty line, including 13.00% of those under age 18 and 8.70% of those age 65 or over.

Cities and towns[]

Coordinates: 43°49′N 112°19′W / 43.82, -112.31

This page uses content from the English language Wikipedia. The original content was at Jefferson County, Idaho. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.