Vanderburgh County is a county in the U.S. state of Indiana. As of 2020, the population was 180,136. The county seat is in Evansville. While Vanderburgh County was the eighth-largest county in 2020 population in Indiana, it is also the eighth-smallest county in area and the smallest in southwestern Indiana, covering only 236 square miles (610 km2).

Gibson County is a county in the southwestern part of the U.S. state of Indiana. As of the 2020 United States Census, the population was 33,011. The county seat is Princeton.