Parke County lies in the western part of the U.S. state of Indiana along the Wabash River. The county was formed in 1821 out of a portion of Vigo County. According to the 2020 census, the population was 16,156. The county seat is Rockville.

Vigo County is a county on the western border of the U.S. state of Indiana. According to the 2020 United States Census, it had a population of 106,153. Its county seat is Terre Haute.