List of state highways in Louisiana (400–449)

Louisiana Highway 400 (LA 400) runs in an east–west direction from a local road northeast of Attakapas Landing to LA 1 north of Supreme, Assumption Parish. From the west, LA 400 begins at the east end of a bridge across the Cancienne Canal. It continues the path of a local road that begins at a junction with LA 401 just north of Attakapas Landing on Lake Verret. LA 400 heads eastward and intersects LA 1011 and LA 1010 before ending at a junction with LA 1 opposite Bayou Lafourche. LA 400 is an undivided two-lane highway for its entire length. ==Louisiana Highway 401==

Louisiana Highway 401 (LA 401) runs in a southwest to northeast direction from a dead end at Lake Verret in Attakapas Landing to a junction with LA 1 in Napoleonville, Assumption Parish. The route's mileposts increase from the eastern end contrary to common practice. ==Louisiana Highway 402==

Louisiana Highway 402 (LA 402) runs in an east–west direction from a local road west of Brusle St. Vincent to LA 308 north of Napoleonville, Assumption Parish. The route's mileposts increase from the eastern end contrary to common practice. ==Louisiana Highway 403==

Louisiana Highway 403 (LA 403) runs in a north–south direction from LA 402 at Brusle St. Vincent to LA 308 at Paincourtville, Assumption Parish. ==Louisiana Highway 404==

Louisiana Highway 404 (LA 404) runs in an east–west direction from LA 75 at Choctaw to LA 69 at Samstown, Iberville Parish. The route's mileposts increase from the eastern end contrary to common practice. ==Louisiana Highway 405==

Louisiana Highway 405 (LA 405) runs in a general north–south direction from LA 1 west of Donaldsonville, Ascension Parish to the junction of LA 1 and LA 75 in Plaquemine, Iberville Parish. ==Louisiana Highway 406==

Louisiana Highway 406 (LA 406) runs in a north–south direction from LA 23 in Belle Chasse, Plaquemines Parish to the junction of two local roads in New Orleans, Orleans Parish. It provides access to the Woodland Bridge across the Gulf Intracoastal Waterway for Belle Chasse and an area of New Orleans known as the Algiers Lower Coast. LA 406 heads north from LA 23 (Belle Chasse Highway) in Belle Chasse. Traveling along Woodland Highway, the route passes a series of newer residential subdivisions. The roadway curves to the northeast, traversing a corner of Orleans Parish, and passes a small cluster of industrial facilities located alongside the Gulf Intracoastal Waterway. LA 406 proceeds straight ahead and crosses from Plaquemines Parish again into Orleans Parish, simultaneously re-entering the New Orleans city limits. After crossing underneath the Woodland Bridge, LA 406 engages in a roundabout with LA 407, which loops around onto the bridge and across the waterway. The highway then passes the entrance to the upscale English Turn residential community and country club. LA 406 curves due east onto Patterson Drive (also known as River Road) along the Mississippi River levee and proceeds to an intersection with Stanton Road. River Road continues as a local road until reaching the U.S. Coast Guard station later. ==Louisiana Highway 407==

Louisiana Highway 407 (LA 407) runs in a north–south direction from LA 406 to LA 428 in New Orleans, Orleans Parish. The route connects General de Gaulle Drive, a major thoroughfare through the Algiers area of the city, with LA 406 via the Woodland Bridge across the Gulf Intracoastal Waterway. LA 407 begins at a roundabout junction with LA 406 (Woodland Highway) near the English Turn residential subdivision in the Lower Coast Algiers area of New Orleans. The divided four-lane highway loops to the north and proceeds across the high-level Woodland Bridge over the Gulf Intracoastal Waterway, located along the Orleans–Plaquemines parish line. Returning to grade, LA 407 intersects General de Gaulle Drive, which continues ahead through Algiers toward the Crescent City Connection bridge spanning the Mississippi River in Downtown New Orleans. LA 407 turns north from this junction onto Woodland Drive and narrows to an undivided four-lane highway. The route continues in this capacity through the residential Old Aurora neighborhood until reaching an intersection with LA 428 (General Meyer Avenue). ==Louisiana Highway 408==

Louisiana Highway 408 (LA 408) runs in an east–west direction from a local road in Baton Rouge to a junction with the concurrent LA 37/LA 64 in Central, East Baton Rouge Parish. The route connects northern Baton Rouge with Greenwell Springs, a rural community within the Central city limits. LA 408 begins on Harding Boulevard at the west end of the Canadian National Railway/Kansas City Southern Railway overpass alongside the Southern University campus. This terminus is located in an area within the Baton Rouge city limits known as Scotlandville. LA 408 heads east across the overpass as a divided four-lane highway and intersects US 61 (Scenic Highway). Several blocks later, the highway passes through an interchange with I-110 at exit 6, connecting to Downtown Baton Rouge and Natchez, Mississippi. Jutting out from this junction is Veterans Memorial Boulevard, a local road that provides access to Baton Rouge Metropolitan Airport. After passing along the south side of the airport, LA 408 crosses LA 67 (Plank Road), and the local name changes from Harding Boulevard to Hooper Road. after exiting the Baton Rouge city limits, LA 408 crosses the Comite River into the suburban city of Central. Over the next are junctions with LA 410 (Blackwater Road), LA 946 (Joor Road), and LA 3034 (Sullivan Road). During this stretch, LA 408 narrows to an undivided two-lane highway. It continues northeast in this capacity until reaching a junction with LA 37/LA 64 (Greenwell Springs Road), which parallels the Amite River. ==Louisiana Highway 409==

Louisiana Highway 409 (LA 409) runs in a north–south direction from LA 64 in Central, East Baton Rouge Parish to LA 959 at Blairstown, East Feliciana Parish. LA 409 heads north on Liberty Road from a T-intersection with LA 64 in area within the Central city limits known as Indian Mound. The highway travels about to the community of Pride, where it curves east onto Pride-Baywood Road then turns north onto Riley Road. North of Pride, LA 409 crosses from East Baton Rouge Parish into East Feliciana Parish and proceeds to a junction with LA 959 at Blairstown. LA 409 is an undivided two-lane highway for its entire length. ==Louisiana Highway 410==

Louisiana Highway 410 (LA 410) runs in a north–south direction along Blackwater Road from LA 408 to LA 64 in Central, East Baton Rouge Parish. ==Louisiana Highway 411==

Louisiana Highway 411 (LA 411) runs in a north–south direction from LA 76 in Rosedale, Iberville Parish to the junction of US 190 and LA 78 in Livonia, Pointe Coupee Parish. The route's mileposts increase from the northern end contrary to common practice. LA 411 heads northwest from LA 76 in Rosedale alongside the east bank of Bayou Grosse Tete. After about , the route passes along the eastern edge of Maringouin, which is accessed by bridge via LA 977. Shortly afterward, the highway crosses from Iberville Parish into Pointe Coupee Parish. LA 411 continues along the bayou until reaching a junction with US 190 (Airline Highway) in Livonia, connecting with the cities of Baton Rouge and Opelousas. LA 78 continues the path of the roadway northward toward New Roads. LA 411 is an undivided two-lane highway for its entire length. ==Louisiana Highway 412==

Louisiana Highway 412 (LA 412) runs in an east–west direction from LA 964 west of Slaughter to LA 67 east of Slaughter, East Feliciana Parish. ==Louisiana Highway 413==

Louisiana Highway 413 (LA 413) runs in a north–south direction from LA 76 south of Erwinville, West Baton Rouge Parish to LA 1 Bus. in New Roads, Pointe Coupee Parish. Prior to the 1955 highway number redesignations, the current LA Highway 413 ran along road beds that were parts of LA State Route 73, LA State Route 139, and LA State Route 135 of the old numbering system. The portion of the highway from Rosedale Road that runs north to near False River was the old LA State Route 73 portion. The portion that runs along False River and carries the local name "Island Road" was the old LA State Route 139 portion. The portion of the current highway that runs east-west from near Patin Dyke to New Roads was the old LA State Route 135 portion. LA 413 heads north on Poydras Bayou Drive from LA 76 (Rosedale Road) in West Baton Rouge Parish. It crosses the concurrent US 190/LA 1 (Airline Highway) in Erwinville. The highway then skirts the Pointe Coupee Parish line for a short time before crossing it at a junction with LA 3091 (Flynn Road). LA 413 makes a brief zigzag onto LA 416 in Lakeland. Shortly afterward, the route turns west at an intersection with LA 414 (Island Road) and makes a long loop alongside False River through Jarreau and Dupont to Ventress. Here, LA 413 meets LA 414 (Ventress Road) a second time and turns north briefly to a junction with LA 415 (Patin Dyke Road) at Patin. The highway turns west once again and enters the city of New Roads, where it terminates at a junction with LA 1 Bus. at the corner of Main and New Roads Streets. LA 413 is an undivided two-lane highway for its entire length. ==Louisiana Highway 414==

Louisiana Highway 414 (LA 414) runs in a general north–south direction from LA 413 north of Lakeland to a second junction with LA 413 at Ventress, Pointe Coupee Parish. The route travels in a loop off of LA 413 around an area between the False River and Mississippi River known as "The Island". LA 414 heads northeast from LA 413 through Chenal and across the Kansas City Southern Railway line to a junction with LA 415 (River Road) at the Mississippi River levee. The route turns north alongside the levee and travels concurrent with LA 415 for . LA 414 then turns west and proceeds back across the KCS rail line to its terminus at LA 414 in Ventress. It is an undivided two-lane highway for its entire length. ==Louisiana Highway 415==

Louisiana Highway 415 (LA 415) runs in a north–south direction from I-10 west of Port Allen, West Baton Rouge Parish to LA 413 east of New Roads, Pointe Coupee Parish. The route has a spur that travels , providing a connection to westbound US 190/LA 1 at Lobdell. ==Louisiana Highway 416==

Louisiana Highway 416 (LA 416) runs in an east–west direction from LA 1 at Knapp to LA 415 at Hermitage, Pointe Coupee Parish. The route's mileposts increase from the eastern end contrary to common practice. LA 416 heads east from LA 1 through Lakeland, where it intersects LA 413. The road curves northeast through Rougon and briefly overlaps LA 983. At Glynn, LA 416 crosses the Kansas City Southern Railway (KCS) tracks at grade and intersects LA 982. The route continues northeast to a junction with LA 415 in Hermitage at the west bank levee of the Mississippi River. LA 416 is an undivided two-lane highway for its entire length. ==Louisiana Highway 417==

Louisiana Highway 417 (LA 417) runs in a north–south direction from LA 10 at Red Cross to LA 418 at Legonier, Pointe Coupee Parish. It exists in two sections, as part of the route between Red Cross and Coon is under local control. ==Louisiana Highway 418==

Louisiana Highway 418 (LA 418) runs in a general north–south direction from LA 417 north of Quinton to LA 1 at Legonier, Pointe Coupee Parish. The route heads northeast from LA 417 and crosses LA 1 in Innis. It then turns northward alongside the west bank levee of the Mississippi River past Williamsport and the Angola Ferry landing. At Torras, LA 418 curves westward and crosses LA 15 near the Old River Lock. The highway continues along the Lower Old River and Atchafalaya River to a second junction with LA 1 in Legonier at the foot of a bridge connecting to Simmesport. LA 418 is an undivided two-lane highway for its entire length. ==Louisiana Highway 419==

Louisiana Highway 419 (LA 419) runs in an east–west direction from LA 417 at Quinton to the junction of two private roads east of Lacour, Pointe Coupee Parish. ==Louisiana Highway 420==