Jefferson County was founded on January 26, 1856, and its governing structure was organized in 1864.[3][4] It was named for Thomas Jefferson, third president of the United States.[5]
Jefferson County lies on the south line of Nebraska. Its south boundary line abuts the north boundary line of the state of Kansas. The terrain of Jefferson County consists of low rolling hills, whose leveled tops are largely used for agriculture. The Little Blue River flows southeastward through the southwestern-middle of the county. The county has a total area of 576 square miles (1,490 km2), of which 570 square miles (1,500 km2) is land and 5.5 square miles (14 km2) (1.0%) is water.[6]
As of the 2000 United States Census,[15] there were 8,333 people, 3,527 households, and 2,352 families in the county. The population density was 14 people per square mile (5.4 people/km2). There were 3,942 housing units at an average density of 7 units per square mile (2.7/km2). The racial makeup of the county was 98.42% White, 0.07% Black or African American, 0.38% Native American, 0.17% Asian, 0.04% Pacific Islander, 0.50% from other races, and 0.42% from two or more races. 1.31% of the population were Hispanic or Latino of any race.
There were 3,527 households, out of which 28.00% had children under the age of 18 living with them, 57.90% were married couples living together, 5.80% had a female householder with no husband present, and 33.30% were non-families. 29.60% of all households were made up of individuals, and 17.20% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.85.
The county population contained 23.30% under the age of 18, 6.10% from 18 to 24, 23.70% from 25 to 44, 24.30% from 45 to 64, and 22.70% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 95.60 males. For every 100 females age 18 and over, there were 91.80 males.
The median income for a household in the county was $32,629, and the median income for a family was $40,747. Males had a median income of $26,929 versus $18,594 for females. The per capita income for the county was $18,380. About 8.00% of families and 8.90% of the population were below the poverty line, including 10.20% of those under age 18 and 8.70% of those age 65 or over.
^"Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^Fitzpatrick, Lilian Linder (1925). Nebraska Place-Names. Lincoln: University of Nebraska Studies in Language, Literature, and Criticism. p. 81. Retrieved December 18, 2014.
