Jefferson County, Idaho

Jefferson County is a located in the  of. 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 ( estimate: 21,580). The is.

Jefferson County is part of the Idaho Falls, ID.

Geography
According to the, the county has a total area of 2,863 (1,106 ). 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

 * - north
 * - northeast
 * - east
 * - south
 * - southwest
 * - west

Demographics
As of the of 2000, there were 19,155 people, 5,901 households, and 4,880 families residing in the county. The 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%, 0.28% or , 0.46% , 0.23% , 0.08% , 6.76% from , and 1.33% from two or more races. 9.96% of the population were or  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 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 for the county was $13,838. About 8.00% of families and 10.40% of the population were below the, including 13.00% of those under age 18 and 8.70% of those age 65 or over.