Marion County | |
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![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 38°39′N 88°55′W / 38.65°N 88.92°W | |
Country | ![]() |
State | ![]() |
Founded | 1823 |
Named for | 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 (10 km2) 0.6% |
Population (2020) | |
• Total | 37,729 |
• Density | 66/sq mi (25/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.[1] Its county seat is Salem.[2]
Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.