State Road 427 is a roughly northeast-southwest two-lane surface road between U.S. Route 6

U.S. Route 6 in Indiana

U.S. Route 6 is a part of the United States Numbered Highway that runs from California to Provincetown, Massachusetts. In Indiana, it is a mostly rural, two-lane route that travels in the northern part of the state. However, some four-lane stretches may be found in Lake and Porter counties. For...

 (US 6) at Waterloo

Waterloo, Indiana

Waterloo is a town in Grant and Smithfield townships, DeKalb County, Indiana, United States. The population was 2,242 at the 2010 census.-Geography:Waterloo is located at ....

 and the Ohio state line east of Hamilton

Hamilton, Indiana

Hamilton is a town located on the border of Steuben County, Indiana and DeKalb County, Indiana. In Steuben County, it is in Otsego Township, and in DeKalb County it is in Franklin Township. The population was 1,532 at the 2010 census.- History :...

. Fifteen miles in length, it is a child of U.S. Route 27

U.S. Route 27 in Indiana

U.S. Route 27 enters Indiana in southeastern part of the state south of the village of Liberty. At Liberty, US 27 turns north, paralleling the Ohio state line. It intersects Interstate 70/U.S. Route 40 at Richmond and continues north to Decatur...

 (US 27), which is now decommissioned north of Fort Wayne

Fort Wayne, Indiana

Fort Wayne is a city in the US state of Indiana and the county seat of Allen County. The population was 253,691 at the 2010 Census making it the 74th largest city in the United States and the second largest in Indiana...

.

Route description

SR 427 begins in downtown Waterloo, in DeKalb County

DeKalb County, Indiana

DeKalb County is a county located in the U.S. state of Indiana. Named for Revolutionary War hero Johann, Baron de Kalb , the county was created by the Indiana legislature in 1835 and organized in 1837. As of 2010, the population was 42,223...

, where US 6 passes through town. It runs northeast to Hamilton, where it crosses into Steuben County

Steuben County, Indiana

Steuben County is a county located in the northeast corner of the U.S. state of Indiana. As of 2010, the population was 34,185. The county seat is Angola...

. In Hamilton, it is concurrent with State Road 1

Indiana State Road 1

State Road 1 is a north–south state highway in the eastern portion of the U.S. state of Indiana. Its southern terminus is at U.S. Highway 50 in east-central Dearborn County, just east of Lawrenceburg. Its northern terminus is at U.S...

 (SR 1) for less than a mile and passes to the southeast of Hamilton Lake. Leaving Hamilton, it heads east to the Ohio

Ohio

Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...

 state line, where it meets Ohio State Route 34

Ohio State Route 34

Ohio State Route 34 is an east–west highway which runs across Northwest Ohio. Its western terminus is at the Ohio-Indiana State Line, 2 miles west of Edon. Its eastern terminus is at a junction with U.S. Route 6 northwest of Napoleon. Bryan is the largest city served by Route 34.-Major...

 into Edon, Ohio

Edon, Ohio

Edon is a village in Williams County, Ohio, United States. The population was 898 at the 2000 census.-Geography:Edon is located at .According to the United States Census Bureau, the village has a total area of , all of it land....

.

History

Before Interstate 69

Interstate 69 in Indiana

Interstate 69 presently exists in two discontinuous segments in Indiana. The original highway, completed in November 1971, runs northeast from the state capital of Indianapolis, to the city of Fort Wayne, and then proceeds north to the state of Michigan...

 (I-69) was completed between Fort Wayne and Auburn

Auburn, Indiana

Auburn is a city in DeKalb County, Indiana, United States. The population was 13,086 at the 2010 census. Founded in 1836 by Wesley Park , the city is the county seat of DeKalb County. Auburn is also known as Home of the Classics.-Geography:...

 during the 1960s, SR 427 extended almost due south along what is now a north–south county road now identified as "Tonkel Road" in Allen county and "CR 427" between the Allen-DeKalb County line and Waterloo. That section of SR 427 was decommissioned

Decommissioned highway

A decommissioned highway is a highway that has been removed from service, shut down or has had its authorization as a federal or state highway removed. Decommissioning can include the complete or partial demolition or abandonment of an old highway structure because the old roadway has lost its...

 soon after the completion of the section of I-69 that parallels that stretch of old SR 427.

Major intersections