Madison County, Illinois

Madison County is a county in the U.S. state of Illinois. It is a part of the Metro East in southern Illinois. According to the 2020 census, it had a population of 264,776, making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state. The county seat is Edwardsville, and the largest city is Granite City.

Madison County is part of the Metro East region of Greater St. Louis. The pre-Columbian city of Cahokia Mounds, a World Heritage Site, was located near Collinsville. Edwardsville is home to Southern Illinois University Edwardsville. To the north, Alton is known for its abolitionist and American Civil War-era history. It is also the home of the Southern Illinois University School of Dental Medicine. Godfrey, the village named for Captain Benjamin Godfrey, offers Lewis and Clark Community College formerly the Monticello Female Seminary.

History
Madison County was established on September 14, 1812. It was formed from parts of Randolph and St. Clair counties and named for President James Madison. At the time of its formation, Madison County included all of the modern State of Illinois north of St. Louis, as well as all of Wisconsin, part of Minnesota, and Michigan's Upper Peninsula.

In the late 19th century, Madison County became an industrial region, and in the 20th century was known first for Graniteware, and later for its steel mills, oil refineries, and other heavy industries. The county had a large working population, and the county and surrounding area was a center of strength for the Democratic Party.

Industrial restructuring cost many jobs and reduced the population. The county now is part of the eastern St. Louis metropolitan area (nicknamed "Metro East"), as is neighboring St. Clair County.

In 2009, the EPA issued an air pollution report that ranked Madison County as the county with the second-highest cancer risk in the country due to air pollution, second only to Los Angeles County, California.

Geography
According to the U.S. Census Bureau, the county has a total area of 741 sqmi, of which 716 sqmi is land and 25 sqmi (3.4%) is water. Madison County is on the Mississippi River, while the other major body of water is Horseshoe Lake.

Climate and weather
In recent years, average temperatures in the county seat of Edwardsville have ranged from a low of 19 °F in January to a high of 90 °F in July, although a record low of -27 °F was recorded in January 1977 and a record high of 114 °F was recorded in July 2012. Average monthly precipitation ranged from 1.99 in in January to 4.24 in in May. Climate Zone 4A per the International Energy Conservation Code.

Adjacent counties and city

 * Bond County - east
 * Clinton County - southeast
 * Jersey County - northwest
 * Macoupin County - north
 * Montgomery County - northeast
 * St. Charles County, Missouri - northwest
 * St. Clair County - south
 * St. Louis, Missouri - west
 * St. Louis County, Missouri - west

Parks and Reserves

 * Chouteau Island
 * Gabaret Island
 * Horseshoe Lake State Park
 * Mosenthein Island

Transportation
Madison County Transit serves the county with 25 bus routes and 85 mi of bike trails. Intercity rail service is provided by Amtrak at Alton station. Trains on the Lincoln Service route travel between Chicago and St. Louis.

Major highways

 * I-55.svg I-55
 * I-70.svg I-70
 * I-255.svg I-255
 * I-270.svg I-270
 * US 40.svg US 40
 * US 67.svg US 67
 * Illinois 3.svg IL 3
 * Illinois 4.svg IL 4
 * Illinois 100.svg IL 100
 * Illinois 162.svg IL 162
 * Illinois 140.svg IL 140
 * Illinois 160.svg IL 160
 * Illinois 143.svg IL 143
 * Illinois 157.svg IL 157
 * Illinois 159.svg IL 159
 * Illinois 111.svg IL 111
 * Illinois 203.svg IL 203
 * Illinois 255.svg IL 255
 * Illinois 267.svg IL 267
 * Illinois 267.svg IL 267

Demographics
According to the 2020 census, the racial makeup of the county was 81.4% white (80.4% white non-Hispanic), 9.4% black or African American, 1.0% Asian, 0.3% American Indian, 6.3% two or more races, and 1.5% some other race. Those of Hispanic or Latino origin made up 4.1% of the population.

According to the 2010 census, there were 269,282 people, 108,094 households, and 71,756 families residing in the county. The population density was 376.3 PD/sqmi. There were 117,106 housing units at an average density of 163.7 /sqmi. The racial makeup of the county was 88.2% white, 7.9% black or African American, 0.8% Asian, 0.2% American Indian, 0.9% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 2.7% of the population. In terms of ancestry, 32.7% were German, 14.9% were Irish, 10.5% were English, 7.5% were American, and 5.7% were Italian.

Of the 108,094 households, 31.4% had children under the age of 18 living with them, 49.3% were married couples living together, 12.2% had a female householder with no husband present, 33.6% were non-families, and 26.8% of all households were made up of individuals. The average household size was 2.46 and the average family size was 2.98. The median age was 38.6 years.

The median income for a household in the county was $51,941 and the median income for a family was $64,630. Males had a median income of $50,355 versus $35,543 for females. The per capita income for the county was $26,127. About 9.1% of families and 12.9% of the population were below the poverty line, including 19.3% of those under age 18 and 6.6% of those age 65 or over.

Cities

 * Alton
 * Collinsville (partly in St. Clair County)
 * Edwardsville
 * Granite City
 * Highland
 * Madison
 * Troy
 * Venice
 * Wood River

Villages

 * Alhambra
 * Bethalto
 * East Alton
 * Fairmont City
 * Glen Carbon
 * Godfrey
 * Grantfork
 * Hamel
 * Hartford
 * Livingston
 * Marine
 * Maryville
 * New Douglas
 * Pontoon Beach
 * Pierron
 * Roxana
 * South Roxana
 * St. Jacob
 * Williamson
 * Worden

Census Designated Places

 * Holiday Shores
 * Mitchell
 * Moro
 * Prairietown
 * Rosewood Heights

Other unincorporated and historic communities

 * Binney
 * Cottage Hills
 * Donkville
 * Dorsey
 * Fosterburg
 * Gard
 * Goshen Settlement
 * Kaufman
 * Kuhn Station
 * LeClaire
 * Lincoln Place
 * Lumaghi Heights
 * Meadowbrook
 * Midway
 * Newport
 * Poag
 * St. Morgan
 * State Park Place
 * Upper Alton
 * Wanda

Townships
Madison County is divided into twenty-four townships:


 * Alhambra
 * Alton
 * Chouteau
 * Collinsville
 * Edwardsville
 * Fort Russell
 * Foster
 * Godfrey
 * Granite City
 * Hamel
 * Helvetia
 * Jarvis
 * Leef
 * Marine
 * Moro
 * Nameoki
 * New Douglas
 * Olive
 * Omphghent
 * Pin Oak
 * Saline
 * St. Jacob
 * Venice
 * Wood River

Islands

 * Chouteau Island
 * Gabaret Island
 * Mosenthein Island

Historic Settlements

 * Camp Dubois

Population ranking
The population ranking of the following table is based on the 2020 census of Madison County.

† county seat

Politics
Like much of southern Illinois, Madison County was a predominantly Democratic area for much of its history, but in recent elections has been moving toward Republican. Mitt Romney narrowly carried the county in the 2012 presidential election, becoming the first Republican presidential nominee to do so since 1984. In 2016, Donald Trump carried the largest share of the vote for any Republican presidential candidate since 1972. The county also supported the Republican candidates for governor in 2010, 2014, 2018, and 2022.

Education

 * Alton Community Unit School District 11
 * Bethalto Community Unit School District 8
 * Collinsville Community Unit School District 10
 * East Alton School District 13
 * East Alton-Wood River Community High School District 14
 * Edwardsville Community Unit School District 7
 * Granite City Community Unit School District 9
 * Highland Community Unit School District 5
 * Madison Community Unit School District 12
 * Roxana Community Unit School District 1
 * Triad Community Unit School District 2
 * Venice Community Unit School District 3
 * Wood River-Hartford Elementary School District 15