Pope County is the southeasternmost county in the U.S. state of Illinois. According to the 2020 census, it had a population of 3,763, making it the second-least populous county in Illinois. Its county seat is Golconda. The county was organized in 1816 from portions of Gallatin and Johnson counties and named after Nathaniel Pope, a politician and jurist from the Illinois Territory and State of Illinois.

Johnson County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 13,308. Its county seat is Vienna. It is located in the southern portion of Illinois known locally as "Little Egypt".