Marion County, Illinois

Marion County, Illinois
Marion County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 37,729. Its county seat is Salem.
Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.
History
Marion County was organized on 24 January 1823 from portions of Jefferson and Fayette counties. It was named in honor of Revolutionary War Gen. Francis Marion, the "Swamp Fox".
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.6%) is water.
The southwest corner of Marion County is the intersection of the Baseline with the Third Principal Meridian, the point of origin for the third survey of the Northwest Territory under the Land Ordinance of 1785. The origin is marked with a boulder south of Centralia just off U.S. 51.
Climate and weather
In recent years, average temperatures in the county seat of Salem have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1994 and a record high of was recorded in August 1983. Average monthly precipitation ranged from in January to in May.
Transit
South Central Transit
Major highways
Interstate 57
U.S. Route 50
U.S. Route 51
Illinois Route 37
Illinois Route 161
Adjacent counties
Fayette County - north
Clay County - east
Wayne County - southeast
Jefferson County - south
Washington County - southwest
Clinton County - west
Demographics
As of the 2010 United States Census, there were 39,437 people, 16,148 households, and 10,746 families residing in the county. The population density was . There were 18,296 housing units at an average density of . The racial makeup of the county was 93.1% white, 3.9% black or African American, 0.6% Asian, 0.3% American Indian, 0.4% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 1.4% of the population. In terms of ancestry, 27.5% were German, 15.8% were Irish, 13.6% were English, and 10.8% were American.
Of the 16,148 households, 30.9% had children under the age of 18 living with them, 48.9% were married couples living together, 12.8% had a female householder with no husband present, 33.5% were non-families, and 28.8% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.91. The median age was 41.4 years.
The median income for a household in the county was $38,974 and the median income for a family was $50,518. Males had a median income of $41,428 versus $28,042 for females. The per capita income for the county was $20,493. About 12.2% of families and 16.5% of the population were below the poverty line, including 23.9% of those under age 18 and 9.6% of those age 65 or over.
Communities
Cities
Centralia
Kinmundy
Salem
Wamac
Villages
Alma
Central City
Iuka
Junction City
Kell
Odin
Patoka
Sandoval
Vernon
Walnut Hill
Townships
Marion County is divided into seventeen townships:
Alma
Carrigan
Centralia
Foster
Haines
Iuka
Kinmundy
Meacham
Odin
Omega
Patoka
Raccoon
Romine
Salem
Sandoval
Stevenson
Tonti
Unincorporated Communities
Greendale
Tonti
Politics
Initially a strongly Democratic anti-Yankee county, Marion County has undergone two transitions. Between 1912 and 2004 it was a perfect bellwether apart from the Catholicism-influenced 1960 election when substantial anti-Catholic voting by its largely southern white population caused it to support Republican Richard Nixon. Since the beginning of the twenty-first century it has voted consistently for Republican presidential candidates.
See also
National Register of Historic Places listings in Marion County, Illinois
References
Illinois counties
1823 establishments in Illinois
Populated places established in 1823
Marion County, Illinois