As of the 2000 census, there were 3,791 people, 1,695 households, and 1,098 families residing in the county. The population density was 4 people per square mile. There were 2,103 housing units at an average density of 2 per square mile. The racial makeup of the county was 98.79% White, 0.34% Native American, 0.05% Asian, 0.03% Black or African American, 0.03% Pacific Islander, 0.05% from other races, and 0.71% from two or more races. Hispanic or Latino of any race were 0.71% of the population. There were 1,695 households, out of which 23.70% had children under the age of 18 living with them, 58.10% were married couplesliving together, 4.80% had a female householder with no husband present, and 35.20% were non-families. 32.40% of all households were made up of individuals, and 18.10% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.80. In the county, the population was spread out, with 21.90% under the age of 18, 4.40% from 18 to 24, 21.50% from 25 to 44, 26.20% from 45 to 64, and 25.90% who were 65 years of age or older. The median age was 46 years. For every 100 females there were 97.90 males. For every 100 females age 18 and over, there were 96.00 males. The median income for a household in the county was $30,538, and the median income for a family was $36,953. Males had a median income of $24,821 versus $18,170 for females. The per capita income for the county was $16,644. About 8.40% of families and 11.60% of the population were below the poverty line, including 12.80% of those under age 18 and 10.90% of those age 65 or over.
Government
Presidential elections
Like all of Kansas outside the eastern cities, Jewell County is overwhelmingly Republican. The only Democratic presidential candidates to win a majority in the county have been Woodrow Wilson in 1916 and William Jennings Bryan in 1896, and the last Democrat to win a plurality was Franklin D. Roosevelt in 1932. Since 1940 only Lyndon Johnson in 1964 and Jimmy Carter in 1976 have exceeded 31 percent of the county's vote, a devotion to the GOP comparable to famous AppalachiaUnionist strongholds like Avery County, North Carolina or Grant County, West Virginia.
Laws
Although the Kansas Constitution was amended in 1986 to allow the sale of alcoholic liquor by the individual drink with the approval of voters. Jewell County restaurants serve only 3.2 beer and no hard alcohol.
Jewell County is divided into twenty-five townships. None of the cities within the county are considered governmentally independent, and all figures for the townships include those of the cities. In the following table, the population center is the largest city included in that township's population total, if it is of a significant size.