Knox County was organized by the Territorial Legislature in 1857, and named L'Eau Qui Court, that being the French name for the river named by the Ponca Niobrara—both names meaning, in English, Running Water. The name was changed to Knox by a statute passed February 21, 1873, which took effect April 1, 1873.[5][6]
Knox County lies along the north line of Nebraska. Its north boundary line abuts the south boundary line of the state of South Dakota. The terrain of the county consists of low rolling hills sloped to the northeast; most of the flat terrain is used for agriculture. The Missouri River flows eastward along the county's north boundary line. The Niobrara River enters the county's west boundary, flowing eastward then northward to drain into the Missouri River near the village of Niobrara. A smaller drainage, Verdigre Creek, flows northward into the county through the western central part of the county, draining into the Niobrara River shortly upstream of that river's mouth.[7] The county has a total area of 1,140 square miles (3,000 km2), of which 1,108 square miles (2,870 km2) is land and 31 square miles (80 km2) (2.8%) is water.[8]
As of the 2000 United States Census,[18] there were 9,374 people, 3,811 households, and 2,595 families in the county. The population density was 8 people per square mile (3.1 people/km2). There were 4,773 housing units at an average density of 4 units per square mile (1.5/km2). The racial makeup of the county was 91.63% White, 0.09% Black or African American, 7.12% Native American, 0.16% Asian, 0.04% Pacific Islander, 0.34% from other races, and 0.63% from two or more races. 0.91% of the population were Hispanic or Latino of any race.
There were 3,811 households, out of which 29.30% had children under the age of 18 living with them, 59.00% were married couples living together, 6.00% had a female householder with no husband present, and 31.90% were non-families. 29.90% of all households were made up of individuals, and 17.40% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.98.
The county population contained 25.50% under the age of 18, 5.50% from 18 to 24, 21.90% from 25 to 44, 23.90% from 45 to 64, and 23.10% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 96.70 males. For every 100 females age 18 and over, there were 95.20 males.
The median income for a household in the county was $27,564, and the median income for a family was $34,073. Males had a median income of $23,373 versus $18,319 for females. The per capita income for the county was $13,971. About 12.50% of families and 15.60% of the population were below the poverty line, including 20.40% of those under age 18 and 13.50% of those age 65 or over.
^"Knox County". Nebraska Association of County Officials. Retrieved December 19, 2014.
^Fitzpatrick, Lilian Linder (1925). Nebraska Place-Names. Lincoln: University of Nebraska Studies in Language, Literature, and Criticism. p. 88. Retrieved December 19, 2014.
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