Marion County Map, Illinois

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

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

Marion County Map, Illinois

Marion County Map, Illinois

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

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Marion County, Illinois

Marion County is a county located in the U.S. state of Illinois. It's county seat is Salem. As per 2020 census, the population of Marion County is 37390 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 572 sq mi (1,481 km2). Marion County was established on 1823.

Facts about Marion County, Illinois

CountryUnited States
StateIllinois
RegionSouth Central Illinois
County SeatSalem
Named AfterFrancis Marion
Established1823
Organized1823
Coordinates38.65° N, 88.92° W
Total Area~576 sq mi
Land Area~572 sq mi
Water Area~4 sq mi
Population (2020)~38,899
Population RankMid-sized county in Illinois
Largest CityCentralia (partially)
Main IndustriesAgriculture, Manufacturing, Energy, Healthcare
Major HighwaysInterstate 57, U.S. Route 50
Time ZoneCentral Time (UTC−06:00)
Known ForCoal mining heritage, rural communities, Salem courthouse
Websitehttps://www.marioncountyil.gov

Ctities in Marion county

City NameTypePopulation (2020)Pop. DensityArea
WamacCity985701.1/sq mi (270.7/km2)1.405 sq mi (3.64 km2)
AlmaVillage318280.9/sq mi (108.5/km2)1.132 sq mi (2.93 km2)
Central CityVillage1,0981,943.4/sq mi (750.3/km2)0.565 sq mi (1.46 km2)
IukaVillage512698.5/sq mi (269.7/km2)0.733 sq mi (1.9 km2)
Junction CityVillage527770.5/sq mi (297.5/km2)0.684 sq mi (1.77 km2)
KellVillage173172.7/sq mi (66.7/km2)1.002 sq mi (2.6 km2)
KinmundyCity733611.9/sq mi (236.2/km2)1.198 sq mi (3.1 km2)
OdinVillage935932.2/sq mi (359.9/km2)1.003 sq mi (2.6 km2)
PatokaVillage525470.9/sq mi (181.8/km2)1.115 sq mi (2.89 km2)
SalemCity7,2821,041.6/sq mi (402.2/km2)6.991 sq mi (18.11 km2)
SandovalVillage1,1571,161.6/sq mi (448.5/km2)0.996 sq mi (2.58 km2)
VernonVillage103116.8/sq mi (45.1/km2)0.882 sq mi (2.28 km2)
Walnut HillVillage95250.0/sq mi (96.5/km2)0.38 sq mi (0.98 km2)
CentraliaCity12,1821,485.6/sq mi (573.6/km2)8.2 sq mi (21.24 km2)

Roads and Highways in Marion County, Illinois

Marion County is well-connected by major highways that provide access to southern Illinois and surrounding regions.

  • Interstate 57 – runs north-south through the county, connecting Centralia to Effingham and Mount Vernon
  • U.S. Route 50 – runs east-west, linking Salem to Centralia and Carlyle
  • U.S. Route 51 – runs north-south, connecting Salem to Centralia and Vandalia
  • Illinois Route 37 – runs north-south, linking Salem to Mount Vernon and Benton
  • Illinois Route 161 – runs east-west, connecting Centralia to Nashville and Iuka

Neighboring Counties of Marion County

  • Fayette County (north)
  • Clay County (east)
  • Jefferson County (south)
  • Washington County (west)
  • Clinton County (southwest)
  • Bond County (northwest)

Top Attractions in Marion County, Illinois

Marion County offers a mix of outdoor recreation, historic sites, and small-town charm centered around Salem and Centralia.

  • William Jennings Bryan Birthplace State Historic Site – A historic site honoring the famous political leader.
  • Centralia Carillon – A large musical instrument tower with regular performances.
  • Salem Downtown Square – Features shops, dining, and historic buildings.
  • Raccoon Lake Recreation Area – Offers fishing, boating, and camping.
  • Centralia Foundation Park – A scenic park with trails, lakes, and open space.
  • Marion County Fairgrounds – Hosts annual fairs and community events.
  • Forbes Lake – A popular destination for outdoor activities and relaxation.

Distance from Marion County to Nearby Cities

  • Salem to Mount Vernon – 20 mi (32 km)
  • Centralia to St. Louis – 60 mi (97 km)
  • Salem to Effingham – 45 mi (72 km)
  • Centralia to Carbondale – 60 mi (97 km)
  • Salem to Springfield – 90 mi (145 km)

FAQs about Marion County

Where is Marion County located?

Marion County is located in southern Illinois, centered around the cities of Salem and Centralia.

What is Marion County known for?

The county is known for its historic sites, parks, and vibrant small-town communities.

What is the county seat of Marion County?

Salem is the county seat, while Centralia is the largest city in Marion County.

Are there outdoor activities in Marion County?

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

How can I reach Marion County?

Marion County is accessible via Interstate 57, U.S. Routes 50 and 51, and several Illinois state highways.