Macon County is a county located in the U.S. state of Illinois. According to the 2010 United States Census, it had a population of 110,768. Its county seat is Decatur.
According to the US Census Bureau, the county has a total area of 586 square miles (1,520 km), of which 581 square miles (1,500 km) is land and 5.2 square miles (13 km) (0.9%) is water.
Macon County is primarily flat, as is most of the state and all of the surrounding counties, the result of geological activity during the Pleistocene epoch. During the Illinoian Stage of the Pleistocene, the Laurentide Ice Sheet covered about 85 percent of Illinois, including the Macon County area. The subsequent thaw of the region and retreat of the ice sheet left central Illinois with its present characteristic flat topography.
Because of its central location, Macon County is often referred to as “The Heart of Illinois.”
As of the 2010 United States Census, there were 110,768 people, 45,855 households, and 29,326 families residing in the county. The population density was 190.8 inhabitants per square mile (73.7/km). There were 50,475 housing units at an average density of 86.9 per square mile (33.6/km). The racial makeup of the county was 79.3% white, 16.3% black or African American, 1.0% Asian, 0.2% American Indian, 0.7% from other races, and 2.5% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population. In terms of ancestry, 21.7% were German, 17.0% were American, 12.9% were Irish, and 10.8% were English.
Of the 45,855 households, 29.5% had children under the age of 18 living with them, 45.7% were married couples living together, 14.1% had a female householder with no husband present, 36.0% were non-families, and 30.9% of all households were made up of individuals. The average household size was 2.33 and the average family size was 2.89. The median age was 40.3 years.
The median income for a household in the county was $44,337 and the median income for a family was $57,570. Males had a median income of $48,570 versus $31,568 for females. The per capita income for the county was $24,726. About 10.3% of families and 15.7% of the population were below the poverty line, including 26.1% of those under age 18 and 6.5% of those age 65 or over.