The original SR 431 designation was assigned to the former routing of US 31 that ran along Westfield Boulevard in Broad Ripple, Nora, and into Carmel (where it became Range Line Road, so-named because it was on a survey Range Line, and also because the "Auto Trail" from Indianapolis to Kokomo was named the "Range Line Highway"). When US 31 was designated in 1926, it followed that route through Broad Ripple. By 1931, a new US 31 had been built from Westfield Boulevard and Meridian Street, north into Carmel, and along what is now Old Meridian Street in that city. The original US 31 was renumbered SR 431.