|Maintained by Louisiana DOTD|
|Length:||51.76 mi (83.30 km)|
|Existed:||1955 renumbering – present|
|South end:||LA 22 / LA 1077 in Madisonville|
| I-12 in Covington
US 190 in Covington
LA 36 in Covington
LA 59 south of Waldheim
LA 40 south of Bush
LA 41 in Bush
LA 16 in Sun
LA 10 in Bogalusa
|North end:||MS 35 at state line|
From the south, LA 21 begins at an intersection with Louisiana Highway 22 and Louisiana Highway 1077 in Madisonville, where LA 21 assumes the trajectory of LA 1077 and heads northeast. LA 1077 branches to the northwest before LA 21 intersects Interstate 12. From south of I-12 and until joining US 190 Business on 21st Avenue in Covington, LA 21 is multilane, in places divided by a median or by a center turn lane, with some control of access.
Through most of Covington LA 21 is in a mostly two-lane undivided concurrency with US 190 Business, which returns to U.S. Route 190 on the east side of Covington—an area known as Claiborne Hill. After intersecting US 190 and before leaving Covington cosigned as Military Road, LA 21 absorbs LA 36 and continues northeastward, absorbing LA 59 and entering a brief concurrency with Louisiana Highway 40 in Bush for less than one mile (1.6 km). Between Bush and Sun, LA 21 widens to a four lane, divided highway after merging Louisiana Highway 41, continuing due north from the merge. In Sun LA 21 absorbs LA 16 and continues northward to Bogalusa, where LA 21 intersects LA 10. LA 21 then runs north through Varnado and Angie before becoming Mississippi Highway 35 at the state line.
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