Marion County, Illinois
Marion County, Illinois | |
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Location within the U.S. state of Illinois | |
| Coordinates: 38°39′N 88°55′W / 38.65°N 88.92°W | |
| Country | United States |
| State | Illinois |
| Founded | 1823 |
| Named after | Francis Marion |
| Seat | Salem |
| Largest city | Centralia |
| Area | |
• Total | 576 sq mi (1,490 km2) |
| • Land | 572 sq mi (1,480 km2) |
| • Water | 3.7 sq mi (9.6 km2) 0.6% |
| Population (2020) | |
• Total | 37,729 |
• Estimate (2024) | 36,437 |
| • Density | 66.0/sq mi (25.5/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 15th |
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.