The road from State Route 32 (now U.S. Route 15) at Zion Crossroads east to Oilville was added to the state highway system by 1923 as State Route 321. Extensions east from Oilville were added for four miles (6 km) in 1924, six miles (10 km) in 1925, and 7.5 miles (12.1 km) in 1926. By 1927, SR 321 became an extension of SR 41 west from Richmond, and that year the former SR 321 was extended 3.5 miles (5.6 km), the rest of the way to Richmond.