State Road 121 (SR 121) is a part of the Indiana State Road that exists in two sections. The first runs between Metamora and Connersville and the second from Richmond to the Ohio state line in US state of Indiana. The 19.52 miles (31.41 km) of SR 121 that lie within Indiana serve as a minor highway. None of the highway is listed on the National Highway System. The entire route is rural two-lane highway that passes through farmland, residential and commercial properties.