Williamson County Map, Illinois

Written and Fact-checked by | Updated On: April 26, 2026 | 14:30 ET

Map of Williamson County - Williamson County is a county located in the U.S. state of Illinois. Williamson County Map showing cities, highways, important places and water bodies. Get Where is Williamson County located in the map, major cities in Williamson county, population, areas, and places of interest.

Williamson County Map, Illinois

Williamson County Map, Illinois

About Williamson County Map, Illinois: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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Williamson County, Illinois

Williamson County is a county located in the U.S. state of Illinois. It's county seat is Marion. As per 2020 census, the population of Williamson County is 66879 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 420 sq mi (1,088 km2). Williamson County was established on 1839.

Facts about Williamson County, Illinois

CountryUnited States
StateIllinois
RegionSouthern Illinois
County SeatMarion
Named AfterWilliamson County, Tennessee
Established1839
Organized1839
Coordinates37.73° N, 88.93° W
Total Area~444 sq mi
Land Area~420 sq mi
Water Area~24 sq mi
Population (2020)~67,215
Population RankMid-sized county in Illinois
Largest CityMarion
Main IndustriesHealthcare, Retail, Education, Manufacturing
Major HighwaysInterstate 57, Illinois Route 13, Illinois Route 148
Time ZoneCentral Time (UTC−06:00)
Known ForSouthern Illinois hub, shopping district, Crab Orchard Lake
Websitehttps://www.williamsoncountyil.gov

Ctities in Williamson county

City NameTypePopulation (2020)Pop. DensityArea
BushVillage241529.7/sq mi (204.5/km2)0.455 sq mi (1.18 km2)
CambriaVillage1,5051,063.6/sq mi (410.7/km2)1.415 sq mi (3.66 km2)
CartervilleCity5,8481,110.5/sq mi (428.8/km2)5.266 sq mi (13.64 km2)
ColpVillage1681,253.7/sq mi (484.1/km2)0.134 sq mi (0.35 km2)
CrainvilleVillage1,443873.0/sq mi (337.1/km2)1.653 sq mi (4.28 km2)
Creal SpringsCity505491.7/sq mi (189.9/km2)1.027 sq mi (2.66 km2)
EnergyVillage974815.7/sq mi (315.0/km2)1.194 sq mi (3.09 km2)
HerrinCity12,3521,277.0/sq mi (493.0/km2)9.673 sq mi (25.05 km2)
HurstCity764861.3/sq mi (332.6/km2)0.887 sq mi (2.3 km2)
Johnston CityCity3,3841,599.2/sq mi (617.5/km2)2.116 sq mi (5.48 km2)
MarionCity16,8551,171.1/sq mi (452.2/km2)14.392 sq mi (37.28 km2)
PittsburgVillage565273.6/sq mi (105.6/km2)2.065 sq mi (5.35 km2)
SpillertownVillage181563.9/sq mi (217.7/km2)0.321 sq mi (0.83 km2)
Freeman SpurVillage268671.7/sq mi (259.3/km2)0.399 sq mi (1.03 km2)
StonefortVillage224154.1/sq mi (59.5/km2)1.454 sq mi (3.77 km2)

Roads and Highways in Williamson County, Illinois

Williamson County is a major transportation hub in southern Illinois, with several highways connecting it to surrounding regions.

  • Interstate 57 – runs north-south through the county, connecting Marion to Carbondale and Effingham
  • Interstate 24 – runs east-west through the county, linking Marion to Paducah, Kentucky and Metropolis
  • Illinois Route 13 – runs east-west, connecting Marion to Carbondale and Harrisburg
  • Illinois Route 37 – runs north-south, linking Marion to Mount Vernon and Benton
  • Illinois Route 148 – runs north-south, connecting Marion to Herrin and Pana

Neighboring Counties of Williamson County

  • Franklin County (north)
  • Saline County (east)
  • Johnson County (southeast)
  • Union County (southwest)
  • Jackson County (west)

Top Attractions in Williamson County, Illinois

Williamson County offers a mix of outdoor recreation, shopping, and entertainment in southern Illinois.

  • Crab Orchard National Wildlife Refuge – A large natural area with lakes, trails, and wildlife viewing.
  • Lake of Egypt – A popular destination for boating, fishing, and waterfront recreation.
  • Williamson County Fairgrounds – Hosts fairs and community events.
  • Marion Downtown Area – Features shops, dining, and local attractions.
  • Illinois Star Centre Mall – A major shopping destination.
  • Rent One Park – Home to baseball games and community events.
  • Herrin City Park – Offers recreational facilities and outdoor activities.

Distance from Williamson County to Nearby Cities

  • Marion to Carbondale – 15 mi (24 km)
  • Marion to Paducah – 50 mi (80 km)
  • Marion to Evansville – 100 mi (161 km)
  • Marion to St. Louis – 120 mi (193 km)
  • Marion to Nashville – 180 mi (290 km)

FAQs about Williamson County

Where is Williamson County located?

Williamson County is located in southern Illinois, centered around the city of Marion.

What is Williamson County known for?

The county is known for its lakes, wildlife refuge, shopping centers, and outdoor recreation.

What is the county seat of Williamson County?

Marion is the county seat and the largest city in Williamson County.

Are there outdoor activities in Williamson County?

Yes, visitors can enjoy lakes, parks, wildlife areas, and outdoor recreation throughout the county.

How can I reach Williamson County?

Williamson County is accessible via Interstates 57 and 24, along with several Illinois state highways.

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