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.

Wayne County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 16,179. Its county seat is Fairfield. It is located in the southern portion of Illinois known locally as "Little Egypt".