Fayette County | |
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![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 39°00′N 89°01′W / 39°N 89.02°W | |
Country | ![]() |
State | ![]() |
Founded | 1821 |
Named for | Marquis de Lafayette |
Seat | Vandalia |
Largest city | Vandalia |
Area | |
• Total | 725 sq mi (1,880 km2) |
• Land | 716 sq mi (1,850 km2) |
• Water | 8.9 sq mi (23 km2) 1.2% |
Population (2020) | |
• Total | 21,488 |
• Density | 30/sq mi (11/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 15th |
Website | www |
Fayette County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 21,488.[1] Its county seat is Vandalia,[2] the site of the Vandalia State House State Historic Site. Ramsey Lake State Recreation Area is located in the northwestern part of this county.