List of former state highways in Indiana (400–999)
This is a list of former state highways in Indiana with route numbers from 400 through 999. For a full list of former state highways in Indiana, see the List of former state highways in Indiana.
State Road 403
State Road 403 was a six-mile northeast-to-southwest route that lies entirely within Clark County. It was decommissioned as a state highway and taken over by the county in 2012.State Road 407
State Road 407 ran from State Road 7 to State Road 3. The route is now Jennings County Road 350 West and CR 500 North.State Road 420
State Road 420 ran from the Illinois State Line to Gary. SR 420 was the original number of Tri-State Expressway; the name was later changed to Borman Expressway.State Road 431
The former State Road 431, now simply Keystone Parkway, remains a busy route connecting U.S. Route 31 with Interstate 465 at Exit 33. It passes through the Indianapolis suburb of Carmel, allowing traffic on U.S. 31 north of Carmel a shorter route to I-465 and the east side of Indianapolis. Until the 1990s, the State Road 431 designation extended south of I-465 to 86th Street. Prior to that, it also continued south along N. Keystone Avenue to S.R. 37 at Fall Creek Parkway, North Drive in Indianapolis.State Road 431 was officially decommissioned on October 19, 2007, with the portions north of 96th Street being turned over to the city of Carmel. Carmel Mayor James Brainard immediately proposed banning heavy trucks from the route, the Hamilton County portions of which lies within his city's corporate limits. He also pushed for a plan to build six roundabout-style interchanges on Keystone, built 2009-2010, in lieu of widening it to at least six travel lanes throughout.
Further south in Marion County, a former southern portion of S.R. 431 extended south along Madison Avenue from the south side of Indianapolis through Greenwood. Madison Avenue, which was the original routing of U.S. 31 on Indy's south side, does not have an interchange with I-465, however. The northern terminus of this section was at Madison's intersection with East Street, which used to carry U.S. 31 to the south. The southern terminus was where Madison merges with existing U.S. 31 alignment in Johnson County just south of Smith Valley Road, south of the old Greenwood Middle School.
State Road 434
State Road 434 ran from U.S. Route 421 to U.S. Route 31 on 73rd Street in Indianapolis.State Road 435
State Road 435 was a northwest–southeast state highway in Cass County, Indiana. It was meant as a connector between the former State Road 329 and the U.S. Highway 24/U.S. Highway 35 bypass south of the city of Logansport.Its route began at the bypass in the southeast and followed East Main Street for its whole route to the northwest, terminating at the former State Road 329 on Burlington Avenue.