Richland County
Also known as Richland County, Illinois, Richland County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- February 24, 1841
- Named after
- Richland County, Ohio
- Seat
- Olney
- Largest city
- Olney
- Total
- 362 sq mi (940 km )
- Land
- 356 sq mi (920 km )
- Water
- 1.9 sq mi (4.9 km ) 0.5%
- Estimate 2025
- 15,219
- Density
- 44.4/sq mi (17.2/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
~6 min read
Article
Richland County is a county located in the U.S. state of Illinois. According to the 2020 United States census, it had a population of 15,813. Its county seat is Olney.
History