Indiana County is a county in the Commonwealth of Pennsylvania. It is located in the west central part of Pennsylvania. As of the 2020 census, the population was 83,246. Its county seat is Indiana. Indiana County comprises the Indiana, PA Micropolitan Statistical Area, which is also included in the Pittsburgh-New Castle-Weirton, PA-WV-OH Combined Statistical Area. The county is part of the Southwest Pennsylvania region of the state.

Indiana is a borough in and the county seat of Indiana County, Pennsylvania, United States. The population was 14,044 at the 2020 census. It is the principal city of the Indiana, Pennsylvania micropolitan area, about 46 miles (74 km) northeast of Pittsburgh. It is a part of the greater Pittsburgh–New Castle–Weirton combined statistical area, as well as the Johnstown and Pittsburgh media markets.