Richland County, Illinois

county in Illinois, United States

Richland County is a county in the U.S. state of Illinois. In the 2020 census, 15,813 people lived there.[1] The county seat is Olney.

Richland County was founded on February 24, 1841.


  1. "QuickFacts: Richland County, Illinois". United States Census Bureau. Retrieved August 11, 2023.