Dearborn County is one of 92 counties of the U.S. state of Indiana located on the Ohio border near the southeast corner of the state. It was formed in 1803 from a portion of Hamilton County, Ohio. In 2010, the population was 50,047. The county seat and largest city is Lawrenceburg. Dearborn County is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area.

Oxford is a city in Butler County, Ohio, United States, in the southwestern portion of the state approximately 40 miles (64 km) northwest of Cincinnati and 40 miles (64 km) southwest of Dayton. It lies in Oxford Township, originally called the College Township. The population was 23,035 at the 2020 census. This college town was founded as a home for Miami University. In 2014, Oxford was rated by Forbes as the "Best College Town" in the United States, based on a high percentage of students per capita and part-time jobs, and a low occurrence of brain-drain.

Greensburg is a city in Decatur County, Indiana, United States. The population was counted at 11,492 at the 2010 census. The city is the county seat of Decatur County.

Ripley County is a county located at the southeastern corner of the U.S. state of Indiana. According to the 2010 Census, the population was 28,818. The county seat is Versailles.