.svg) Louisiana Highway 42 | ||||
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| Route information | ||||
| Maintained by Louisiana DOTD | ||||
| Length | 47.8 mi[1] (76.9 km) | |||
| Existed | 1955 renumbering–present | |||
| Major junctions | ||||
| West end |  LA 30 in Baton Rouge | |||
 I-10 in Baton Rouge US 61 in Prairieville | ||||
| East end |  LA 22 in Springfield | |||
| Location | ||||
| Country | United States | |||
| State | Louisiana | |||
| Parishes | East Baton Rouge, Ascension, Livingston, Tangipahoa | |||
| Highway system | ||||
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Louisiana Highway 42 (LA 42) is a state highway in Louisiana that serves East Baton Rouge, Ascension, Livingston, and Tangipahoa parishes. It spans 47.8 miles (76.9 km) in a general east–west direction.