Scott County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 5,355, making it the fourth-least populous county in Illinois. Its county seat is Winchester.
According to the U.S. Census Bureau, the county has a total area of 253 square miles (660 km), of which 251 square miles (650 km) is land and 1.9 square miles (4.9 km) (0.7%) is water. The county’s western boundary is formed by the Illinois River.
As of the 2010 census, there were 5,355 people, 2,214 households, and 1,516 families residing in the county. The population density was 21.3 inhabitants per square mile (8.2/km). There were 2,459 housing units at an average density of 9.8 per square mile (3.8/km). The racial makeup of the county was 98.6% white, 0.2% Asian, 0.2% American Indian, 0.2% black or African American, 0.1% from other races, and 0.7% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population. In terms of ancestry, 26.3% were German, 24.3% were American, 18.0% were English, and 16.2% were Irish.
Of the 2,214 households, 32.0% had children under the age of 18 living with them, 54.7% were married couples living together, 9.1% had a female householder with no husband present, 31.5% were non-families, and 27.3% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.89. The median age was 42.7 years.
The median income for a household in the county was $49,462 and the median income for a family was $64,412. Males had a median income of $40,781 versus $32,011 for females. The per capita income for the county was $27,530. About 6.5% of families and 9.1% of the population were below the poverty line, including 9.5% of those under age 18 and 10.2% of those age 65 or over.