Greene County is a county located in the U.S. state of Illinois. According to the 2020 United States Census, it has a population of 11,843. Its county seat is Carrollton.
A notable archaeological area, the Koster Site, has produced evidence of more than 7,000 years of human habitation. Artifacts from the site are displayed at the Center for American Archeology in Kampsville, Illinois.
History
Greene County is named in honor of General Nathanael Greene, a hero of the American Revolutionary War. In 1821, three years after Illinois became a state, Greene County was established, being carved out of what was previously Madison county and St. Clair county before that. Over the course of the next 18 years four more counties were formed out of what was once Greene Country. These include Scott, Morgan, Macoupin and Jersey counties. This left Greene county with approximately 546 square miles of land located in western-central Illinois near the Illinois River, which was an important resource that provided both a means for travel and to ship goods. Like much of southern Illinois the earliest settlers in the county came from Southern states such as North and South Carolina, Virginia, Kentucky, and Tennessee. By the time of the Civil War, 1860, the population of Greene County had grown to 16,093 and 10% of the adult population had been born in the Northeast, 15% were foreign born, 25% were born in Southern states, and almost 50% had been born in the Midwest. Of the population born in the Midwest many could still trace their roots to the South, with almost 80% of them having a parents born in a Southern state.
Geography
According to the US Census Bureau, the county has a total area of , of which is land and (0.6%) is water.
Climate and weather
In recent years, average temperatures in the county seat of Carrollton have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1912 and a record high of was recorded in July 1934. Average monthly precipitation ranged from in January to in May.
Major highways
U.S. Highway 67
Illinois Route 100
Illinois Route 108
Illinois Route 267
Adjacent counties
Scott County - north
Morgan County - north
Macoupin County - east
Jersey County - south
Calhoun County - southwest
Pike County - northwest
National protected area
Two Rivers National Wildlife Refuge (part: Apple Creek Division)
Demographics
As of the 2010 United States Census, there were 13,886 people, 5,570 households, and 3,777 families living in the county. The population density was . There were 6,389 housing units at an average density of . The racial makeup of the county was 97.9% white, 0.9% black or African American, 0.2% American Indian, 0.1% Asian, 0.3% 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, 30.7% were German, 14.7% were Irish, 13.3% were English, and 12.1% were American.
Of the 5,570 households, 30.9% had children under the age of 18 living with them, 53.0% were married couples living together, 9.4% had a female householder with no husband present, 32.2% were non-families, and 27.8% of all households were made up of individuals. The average household size was 2.44 and the average family size was 2.95. The median age was 41.6 years.
The median income for a household in the county was $41,450 and the median income for a family was $52,049. Males had a median income of $38,185 versus $27,231 for females. The per capita income for the county was $22,107. About 11.8% of families and 15.1% of the population were below the poverty line, including 22.1% of those under age 18 and 10.0% of those age 65 or over.
Communities
Cities
Carrollton
Greenfield
Roodhouse
White Hall
Villages
Eldred
Hillview
Kane
Rockbridge
Wilmington
Unincorporated communities
Barrow
Belltown
Drake
Fayette
Wrights
Townships
Athensville
Bluffdale
Carrollton
Kane
Linder
Patterson
Rockbridge
Roodhouse
Rubicon
Walkerville
White Hall
Woodville
Wrights
Population ranking
The population ranking of the following table is based on the 2020 census of Greene County.