Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. State Road 75, the highest two-digit route in the U.S. state of Indiana consists of two discontinuous north south segments.The southern section is about 37 miles (60 km) long. It begins at U.S. Route 40 at the Putnam-Hendricks county line and runs northward through the towns of Coatesville and North Salem in Hendricks County, and Jamestown and Advance in Boone County. There is a junction with U.S. Route 136 at Jamestown, and a junction with Interstate 74 just to the north. The northern terminus is at State Road 47 in the town of Thorntown.