U.S. Route 12 in Indiana

U.S. Route 12 (US 12) is a part of the United States Numbered Highway System that runs from Aberdeen, Washington, to Detroit, Michigan. In the U.S. state of Indiana, it is part of the state road system. US 12 enters the state concurrent with US 20 and US 41 in Whiting. The 45.16 miles (72.68 km) of US 12 that lie within Indiana serve as a major conduit. Some of the highway is listed on the National Highway System. Various sections are rural two-lane highway, urbanized four-lane undivided highway and one-way streets. The easternmost community along the highway is Michiana Shores at the Michigan state line.

US 12 passes through urban areas and wood lands, parallel to the Lake Michigan shoreline. The highway is included in the Lake Michigan Circle Tour and passes through the Indiana Dunes National Lakeshore. Historical landmarks along the highway include the Miller Town Hall, Beverly Shores South Shore Railroad Station and the Old Michigan City Lighthouse. A memorial highway designations have been applied to the route since 1917, named for the Civil War Union Army unit.