Jefferson County (county code JF) is a county located in the U.S. state of Kansas. At the 2020 census, the county population was 18,368. Its county seat and most populous city is Oskaloosa. According to the U.S. Census Bureau, the county has a total area of 557 square miles (1,440 km2), of which 533 square miles (1,380 km2) is land and 2.4 square miles (6.2 km2) (4.3%) is water. Jefferson County is included in the Topeka, KS Metropolitan Statistical Area. At the 2000 Census, there were 18,426 people, 6,830 households and 5,190 families residing in the county. The population density was 34 inhabitants per square mile (13/km2). There were 7,491 housing units at an average density of 14 per square mile (5.4/km2). The racial makeup of the county was 96.70% White, 0.92% Native American, 0.37% Black or African American, 0.17% Asian, 0.01% Pacific Islander, 0.42% from other races, and 1.41% from two or more races. Hispanic or Latino of any race were 1.28% of the population. More information...
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