Williamson County, Illinois

Williamson County, Illinois

Williamson County Courthouse in Marion
Map of Illinois highlighting Williamson County
Location in the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location in the U.S.
Founded 1839
Named for Williamson County, Illinois
Seat Marion
Largest city Marion
  Total 444 sq mi (1,150 km2)
  Land 420 sq mi (1,088 km2)
  Water 24 sq mi (62 km2), 5.4%
  (2010) 66,357
  Density 158/sq mi (61/km²)
Congressional district 12th
Time zone Central: UTC-6/-5
Website www.williamsoncountyil.gov

Williamson County is a county located in the southern part of the U.S. state of Illinois. According to the 2010 census, it had a population of 66,357.[1] Its county seat is Marion.[2]

Williamson County is included in the Carbondale-Marion, IL Metropolitan Statistical Area. It is located in an area known as Little Egypt.

Williamson is a rapidly growing county in the Metro Lakeland area and is located 88 miles (142 km) southeast of St. Louis, Missouri. Its location at the intersection of Interstates 57 and 24, and Illinois Route 13, a primary east-west four-lane expressway, gives it access to the major communities of Murphysboro, Carbondale, Carterville, Herrin, Marion and Harrisburg. Although the Williamson County population is only 66,357, it is located in the heart of the Metro Lakeland area of Jackson-Williamson Counties where 120,000 citizens of Illinois make their home. Carbondale (14 miles west), Herrin and Marion are the key urban areas in Metro Lakeland, with a combined population of over 65,000. Over 235,000 people live within 35 miles (56 km).


Williamson County was formed out of Franklin County on February 28, 1839, and was named for Williamson County, Tennessee.[3]

Williamson County is often referred to as "Bloody Williamson" due to several outbreaks of violence that have few parallels in American history.[4] These include the Bloody Vendetta (1876), the Carterville Massacre (1899), Coal Strike (1906), The Herrin Massacre (1922), the Klan War (1924–1926), and the Birger/Shelton Gang War, 1926. The Illinois National Guard was deployed repeatedly during the 1920s to separate the warring parties and attempt to keep order.

As with the entire United States, severe weather in Williamson County is not uncommon. The northwest section of the county was obliterated by the Tri-State Tornado of 1925. The county was also struck by 2 tornadoes on May 29, 1982 killing 10 people in the Marion, Illinois tornado outbreak. On May 8, 2009, the cities of Carterville, Herrin, and Marion were severely damaged by the May 2009 Southern Midwest derecho.


Map of Williamson County, Illinois

According to the U.S. Census Bureau, the county has a total area of 444 square miles (1,150 km2), of which 420 square miles (1,100 km2) is land and 24 square miles (62 km2) (5.4%) is water.[5]

Adjacent counties

National protected area

Major highways


Williamson County Regional Airport is the local airport.


Historical population
Census Pop.
Est. 201567,466[6]1.7%
U.S. Decennial Census[7]
1790-1960[8] 1900-1990[9]
1990-2000[10] 2010-2013[1]

As of the 2010 United States Census, there were 66,357 people, 27,421 households, and 17,999 families residing in the county.[11] The population density was 157.9 inhabitants per square mile (61.0/km2). There were 30,359 housing units at an average density of 72.3 per square mile (27.9/km2).[5] The racial makeup of the county was 92.7% white, 3.8% black or African American, 0.8% Asian, 0.4% American Indian, 0.5% from other races, and 1.7% from two or more races. Those of Hispanic or Latino origin made up 2.0% of the population.[11] In terms of ancestry, 23.6% were German, 17.3% were Irish, 16.0% were English, 9.0% were American, and 6.1% were Italian.[12]

Of the 27,421 households, 30.2% had children under the age of 18 living with them, 49.4% were married couples living together, 11.5% had a female householder with no husband present, 34.4% were non-families, and 29.1% of all households were made up of individuals. The average household size was 2.35 and the average family size was 2.88. The median age was 40.1 years.[11]

The median income for a household in the county was $40,579 and the median income for a family was $50,929. Males had a median income of $41,428 versus $30,901 for females. The per capita income for the county was $22,164. About 13.3% of families and 16.7% of the population were below the poverty line, including 24.3% of those under age 18 and 9.9% of those age 65 or over.[13]

Government and infrastructure

United States Penitentiary, Marion is located in Southern Precinct in Williamson County.[14][15]

Climate and weather

Marion, Illinois
Climate chart (explanation)
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: The Weather Channel[16]

Williamson County lies on the border between humid continental climate (Köppen climate classification Dfa) and humid subtropical climate (Köppen climate classification Cfa), with neither large mountains nor large bodies of water to moderate its temperature. It is subject to both cold Arctic air and hot, humid tropical air from the Gulf of Mexico and, along with the rest of the midwestern United States, is home to some of the largest temperature extremes in the world. The region has four distinct seasons. Spring is the wettest season and produces erratic severe weather ranging from tornadoes to winter storms. Summers are hot and humid with only occasional and brief respite, and the humidity often makes the heat index rise to temperatures feeling well above 100 °F (38 °C). Fall is mild with lower humidity and can produce intermittent bouts of heavy rainfall with the first snow flurries usually forming in late November. Winters are cold with periodic snow and temperatures often below freezing, however thaws are usually frequent. Winter storm systems, such as Alberta clippers and Panhandle hooks, can bring days of heavy freezing rain, ice pellets, and snowfall.

The normal high temperature in July is 90 °F (32 °C), and the normal low temperature in January is 19 °F (−6 °C), although this varies from year to year. Both 100 °F (37.8 °C) and 0 °F (−17.8 °C) temperatures can be seen on an average 2 or 3 days per year. In recent years, average temperatures have ranged from a low of 19 °F (−7 °C) in January to a high of 88 °F (31 °C) in July, although a record low of −25 °F (−32 °C) was recorded in January 1977 and a record high of 113 °F (45 °C) was recorded in August 1977. Average monthly precipitation ranged from 3.06 inches (78 mm) in October to 4.93 inches (125 mm) in May.[16]

Williamson County experiences thunderstorms about 50 days a year on average. Thunderstorms contribute over half of the annual precipitation. Especially in the spring, these storms can often be severe, with high winds, large hail and tornadoes.

Some late autumns feature the warm weather known as Indian summer; some years see roses in bloom as late as early December.




Unincorporated communities

Ghost towns


The following precincts are not voting precincts, but represent the 12 Congressional townships in Williamson County. Most have multiple voting precincts.

See also


  1. 1 2 "State & County QuickFacts". United States Census Bureau. Retrieved July 9, 2014.
  2. "Find a County". National Association of Counties. Retrieved 2011-06-07.
  3. Adams, James N. (compiler) (1989), Keller, William E., ed., Illinois Place Names, Springfield: Illinois State Historical Society, p. 609, ISBN 0-912226-24-2
  4. Angle, Paul M. (1992), Bloody Williamson - A Chapter in American Lawlessness, University of Illinois Press, ISBN 0-252-06233-7
  5. 1 2 "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Retrieved 2015-07-12.
  6. "County Totals Dataset: Population, Population Change and Estimated Components of Population Change: April 1, 2010 to July 1, 2015". Retrieved July 2, 2016.
  7. "U.S. Decennial Census". United States Census Bureau. Retrieved July 9, 2014.
  8. "Historical Census Browser". University of Virginia Library. Retrieved July 9, 2014.
  9. "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 9, 2014.
  10. "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 9, 2014.
  11. 1 2 3 "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Retrieved 2015-07-12.
  12. "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-12.
  13. "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-07-12.
  14. "USP Marion Contact Information." Federal Bureau of Prisons. Retrieved on June 5, 2010.
  15. "Marion city, Illinois." U.S. Census Bureau. Retrieved on June 5, 2010.
  16. 1 2 "Monthly Averages for Marion, Illinois". The Weather Channel. Retrieved 2011-01-27.

Further reading

Coordinates: 37°44′N 88°56′W / 37.73°N 88.93°W / 37.73; -88.93

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