Hancock County is a county in the U.S. state of Illinois. According to the 2010 census, it has a population of 19,104. Its county seat is Carthage, and its largest city is Hamilton. The county is made up of rural towns with many farmers.
According to the U.S. Census Bureau, the county has a total area of 814 square miles (2,110 km), of which 794 square miles (2,060 km) is land and 21 square miles (54 km) (2.5%) is water.
As of the 2010 United States Census, there were 19,104 people, 8,040 households, and 5,427 families residing in the county. The population density was 24.1 inhabitants per square mile (9.3/km). There were 9,274 housing units at an average density of 11.7 per square mile (4.5/km). The racial makeup of the county was 98.0% white, 0.3% black or African American, 0.2% Asian, 0.2% American Indian, 0.1% Pacific islander, 0.3% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 1.0% of the population. In terms of ancestry, 34.7% were German, 13.8% were English, 13.2% were American, and 12.1% were Irish.
Of the 8,040 households, 27.5% had children under the age of 18 living with them, 55.3% were married couples living together, 8.3% had a female householder with no husband present, 32.5% were non-families, and 28.2% of all households were made up of individuals. The average household size was 2.35 and the average family size was 2.85. The median age was 44.6 years.
The median income for a household in the county was $42,857 and the median income for a family was $55,162. Males had a median income of $41,609 versus $27,648 for females. The per capita income for the county was $22,885. About 8.9% of families and 12.6% of the population were below the poverty line, including 17.8% of those under age 18 and 9.9% of those age 65 or over.