 | This article needs to be updated. (July 2015) |
 U.S. Route 231 | ||||
|---|---|---|---|---|
 US 231 highlighted in red | ||||
| Route information | ||||
| Maintained by INDOT | ||||
| Length | 284.277 mi[1] (457.499 km) | |||
| Existed | August 22, 1952[2]–present | |||
| Major junctions | ||||
| South end |  US 231 at Kentucky state line | |||
| ||||
| North end |  US 41 in St. John | |||
| Location | ||||
| Country | United States | |||
| State | Indiana | |||
| Counties | Spencer, Dubois, Martin, Daviess, Greene, Owen, Putnam, Montgomery, Tippecanoe, White, Jasper, Porter, Lake | |||
| Highway system | ||||
| ||||
| ||||
U.S. Route 231 (US 231) is the longest numbered highway in Indiana, covering over 284 miles (457 km). It is a main north–south highway in the western part of the state. The southern terminus of US 231 in Indiana is at the Kentucky state line and the northern terminus is at US 41 just south of St. John. The highway is a mixture of expressway and two-lane roadway. The expressway portions exist mainly in southern Indiana and around the Lafayette-West Lafayette area, with the rest mainly being two lanes.
- ^ Indiana Department of Transportation (July 2016). Reference Post Book (PDF). Indianapolis: Indiana Department of Transportation. Retrieved February 9, 2017.
- ^ Weingroff, Richard (April 7, 2011). "US 231 – Indiana to Florida: How a Highway Grew". Highway History. Federal Highway Administration. Retrieved May 15, 2012.