Marshall County | |
---|---|
Lacon Bridge in the county seat | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 41°02′N 89°20′W / 41.03°N 89.34°W | |
Country | ![]() |
State | ![]() |
Founded | January 19, 1839 |
Named for | John Marshall |
Seat | Lacon |
Largest city | Henry |
Area | |
• Total | 399 sq mi (1,030 km2) |
• Land | 387 sq mi (1,000 km2) |
• Water | 12 sq mi (30 km2) 2.9% |
Population (2020) | |
• Total | 11,742 |
• Estimate (2023) | 11,683 ![]() |
• Density | 29/sq mi (11/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 16th |
Website | www |
Marshall County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 11,742.[1] Its county seat is Lacon.[2] Marshall County is part of the Peoria metropolitan area.