Fayette County
Also known as Fayette County, Illinois, Fayette County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Named after
- Marquis de Lafayette
- Seat
- Vandalia
- Largest city
- Vandalia
- Total
- 725 sq mi (1,880 km )
- Land
- 716 sq mi (1,850 km )
- Water
- 8.9 sq mi (23 km ) 1.2%
- Estimate 2025
- 20,790
- Density
- 30.0/sq mi (11.6/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
Article
Fayette County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 21,488. Its county seat is Vandalia, the site of the Vandalia State House State Historic Site. Ramsey Lake State Recreation Area is located in the northwestern part of this county.
History