Prior to 1870, the portion of the Republican valley that now includes Harlan County was a prized hunting ground for indigenous peoples, and their efforts to keep intruders away deterred white settlement in the area. The defeat of the Sioux at the Battle of Summit Springs in 1869 largely eliminated this threat, and several parties were organized to explore the agricultural possibilities of the area. A party of forty men from eastern Nebraska settled near the site of present-day Orleans in August 1870. In 1871, a party from the Wyoming Territory, led by Thomas Harlan, settled near present-day Alma, which was named after a settler's daughter. In that year, Harlan County was separated from Lincoln County by the Nebraska state legislature. Accounts differ as to the county's namesake: either Thomas Harlan, or James Harlan, who was U.S. Secretary of the Interior between 1865 and 1866.
Geography
The Republican River flows southeastward across the lower part of Harlan County, being impounded by the Harlan County Lake at the SE corner of the county. The terrain consists of gently rolling low hills, with the majority of flat areas being used for center pivot irrigation. The county has a total area of, of which is land and is water.
As of the 2000 United States Census, there were 3,786 people, 1,597 households, and 1,049 families in the county. The population density was 7 people per square mile. There were 2,327 housing units at an average density of 4 per square mile. The racial makeup of the county was 98.86% White, 0.13% Black or African American, 0.11% Native American, 0.08% Asian, 0.03% Pacific Islander, 0.16% from other races, and 0.63% from two or more races. 0.77% of the population were Hispanic or Latino of any race. There were 1,597 households out of which 25.70% had children under the age of 18 living with them, 59.00% were married couplesliving together, 4.30% had a female householder with no husband present, and 34.30% were non-families. 30.80% of all households were made up of individuals and 16.70% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.93. The county population contained 24.20% under the age of 18, 5.00% from 18 to 24, 21.60% from 25 to 44, 26.20% from 45 to 64, and 23.00% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 98.00 males. For every 100 females age 18 and over, there were 96.80 males. The median income for a household in the county was $30,679, and the median income for a family was $36,875. Males had a median income of $27,580 versus $18,411 for females. The per capita income for the county was $15,618. About 7.00% of families and 10.10% of the population were below the poverty line, including 14.40% of those under age 18 and 9.10% of those age 65 or over.
