Barton County was drawn in the shape of a square. According to the U.S. Census Bureau, the county has a total area of, of which is land and is water. The geographic center of Kansas is located in Barton County.
The Great Bend Micropolitan Statistical Area includes all of Barton County. As of the 2000 census, there were 28,205 people, 11,393 households, and 7,530 families residing in the county. The population density was 32 people per square mile. There were 12,888 housing units at an average density of 14 per square mile. The racial makeup of the county was 92.98% White, 1.15% Black or African American, 0.51% Native American, 0.23% Asian, 0.01% Pacific Islander, 3.51% from other races, and 1.60% from two or more races. Hispanic or Latino of any race were 8.31% of the population. There were 11,393 households, out of which 31.30% had children under the age of 18 living with them, 55.10% were married couplesliving together, 7.80% had a female householder with no husband present, and 33.90% were non-families. 30.20% of all households were made up of individuals, and 14.30% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.01. In the county, the population was spread out, with 26.00% under the age of 18, 9.00% from 18 to 24, 25.10% from 25 to 44, 22.00% from 45 to 64, and 17.90% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 93.80 males. For every 100 females age 18 and over, there were 90.10 males. The median income for a household in the county was $32,176, and the median income for a family was $39,929. Males had a median income of $28,803 versus $20,428 for females. The per capita income for the county was $16,695. About 9.90% of families and 12.90% of the population were below the poverty line, including 17.00% of those under age 18 and 10.90% of those age 65 or over.
Government
Presidential elections
Prior to 1940, Barton County was a Democratic-leaning swing county in presidential elections, being a national bellwether from 1912 to 1936. From 1940 on, it has become a Republican Party stronghold, with the solitary Democratic Party presidential candidate to carry it since then being Lyndon B. Johnson in his national landslide of 1964.
Laws
Barton County was a prohibition, or "dry", county until the Kansas Constitution was amended in 1986 and voters approved the sale of alcoholic liquor by the individual drink with a 30% food sales requirement. The food sales requirement was removed with voter approval in 2004.
Barton County is divided into twenty-two townships. The cities of Ellinwood, Great Bend, and Hoisington are considered governmentally independent and are excluded from the census figures for the townships. 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.