Dawson County is part of the Lexington, Nebraska, Micropolitan Statistical Area.
In the Nebraska license plate system, Dawson County is represented by the prefix 18 (it had the eighteenth-largest number of vehicles registered in the county when the license plate system was established in 1922).
1860 - 16 1870 - 103 1880 - 2,909 1890 - 10,129 1900 - 12,264 1910 - 15,961 1920 - 16,004 1930 - 17,875 1940 - 17,890 1950 - 19,393 1960 - 19,405 1970 - 19,771 1980 - 22,304 1990 - 19,940 2000 - 24,365
As of the census of 2000, there were 24,365 people, 8,824 households, and 6,273 families residing in the county. The population density was 24 people per square mile (9/km²). There were 9,805 housing units at an average density of 10 per square mile (4/km²). The racial makeup of the county was 82.32% White, 0.31% Black or African American, 0.67% Native American, 0.66% Asian, 0.01% Pacific Islander, 14.49% from other races, and 1.53% from two or more races. 25.36% of the population were Hispanic or Latino of any race. 32.0% were of German, 6.7% American, 6.7% Irish and 6.4% English ancestry according to Census 2000.
There were 8,824 households out of which 35.80% had children under the age of 18 living with them, 58.80% were married couples living together, 7.90% had a female householder with no husband present, and 28.90% were non-families. 24.60% of all households were made up of individuals and 12.00% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.21.
In the county the population was spread out with 29.20% under the age of 18, 8.40% from 18 to 24, 27.60% from 25 to 44, 20.70% from 45 to 64, and 14.10% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 101.70 males. For every 100 females age 18 and over, there were 100.90 males.
The median income for a household in the county was $36,132, and the median income for a family was $42,224. Males had a median income of $26,865 versus $20,569 for females. The per capita income for the county was $15,973. About 8.60% of families and 10.80% of the population were below the poverty line, including 14.20% of those under age 18 and 9.20% of those age 65 or over.