Perry County is a county located in the southwestern part of the U.S. state of Indiana. As of 2010, the population was 19,338. The county seat is Tell City. It is the hilliest county as well as one of the most forested counties of in Indiana as it features more than 60,000 acres (240 km²) of Hoosier National Forest. The Ohio River Scenic Byway along Indiana State Road 66 runs along the southern border of the county while Interstate 64 traverses the northern portion of the county.