List of state highways in Louisiana (600–649)
The following is a list of state highways in the U.S. state of Louisiana designated in the 600–649 range.
Louisiana Highway 600
Louisiana Highway 600 runs from Parhams to Lismore.Louisiana Highway 601
Louisiana Highway 601 runs runs in a north–south direction from Eakers Street and Crothers Drive near I-20 and LA 602-1 in Richmond, along Crothers Drive, to and Johnson Street to US 65 in downtown Tallulah. LA 601 also serves as the eastern terminus for LA 3202.LA 601 first appeared on the official state highway map in 1976, running between US 65 in Tallulah, to LA 602 in Richmond, south of present day I-20. In 1977, LA 601 was truncated to its current terminus after I-20 was completed, cutting off the southern section of the route. This former section of LA 601 is now known as Eaker Road and is locally maintained.
;Major intersections
Louisiana Highway 602
Louisiana Highway 602 presently consists of two segments of state highways in Madison Parish that connect I-20 and US 80. The two segments of this road previously connected on a road south of I-20 paralleling Brushy Bayou and Walnut Bayou. LA 602 first appeared on state highway maps in 1960, utilizing this route. LA 602 ran in total length. The middle segment between I-20 exits 173 and 182, which comprised most of the route, was deleted from the state highway system around 2013. The remaining sections between I-20 and US 80 became LA 602-1 and LA 602-2 respectively, effectively retiring the non-hyphenated LA 602 designation.Louisiana Highway 602-1
Louisiana Highway 602-1 runs near Richmond between US 80 and I-20's exit 173. It is a two-lane roadway that runs to the east of Richmond mostly paralleling a canal named Brushy Bayou.;Major intersections
Louisiana Highway 602-2
Louisiana Highway 602-2 runs inside Mound between I-20's exit 182 and US 82.;Major intersections
Louisiana Highway 603
Louisiana Highway 603 runs from Quimby to Richmond.Louisiana Highway 604
Louisiana Highway 604 runs from St. Joseph to Lake Bruin.Louisiana Highway 605
Louisiana Highway 605 runs in a north-south direction from the junction of LA 128 and LA 897-1 in St. Joseph to US 65 north of Newellton, Tensas Parish.LA 605 heads north from St. Joseph following the shoreline of Lake Bruin, an oxbow lake of the Mississippi River. The highway intersects LA 607 and LA 604 as it breaks away from the lake to the northeast. It then intersects LA 608 and turns northwest, continuing the route of that highway along Lake St. Joseph, a second oxbow lake. Passing through the town of Newellton, LA 605 intersects LA 4 and LA 887. Following a turn to the north at Balmoral, the highway ends at an intersection with US 65.
Louisiana Highway 606
Louisiana Highway 606 runs at Lake Bruin.Louisiana Highway 607
Louisiana Highway 607 runs in an east-west direction from US 65 to LA 605 north of Lake Bruin, Tensas Parish.The route serves as a short connector, providing access to Lake Bruin from US 65. LA 607 is located roughly midway between St. Joseph and Newellton. It is an undivided two-lane highway for its entire length.
Louisiana Highway 608
Louisiana Highway 608 runs from Lake St. Joseph to Balmoral.Louisiana Highway 609
Louisiana Highway 609 runs in Dunn.Louisiana Highway 610
Louisiana Highway 610 runs in Swampers.Louisiana Highway 611
Louisiana Highway 611 is a collection of three current and ten former state-maintained streets in Jefferson, Metairie, and New Orleans. All thirteen routes were established with the 1955 Louisiana Highway renumbering.Louisiana Highway 612
Louisiana Highway 612 runs from Bossier City to Sligo.Louisiana Highway 613
Louisiana Highway 613 was a collection of four state-maintained streets in Metairie and New Orleans established with the 1955 Louisiana Highway renumbering. All four routes have since been deleted from the state highway system.Louisiana Highway 614
Louisiana Highway 614 runs in Haughton.Louisiana Highway 615
Louisiana Highway 615 runs in an east-west direction from a junction with LA 157 and LA 159 north of Shongaloo, Webster Parish to US 79 in Haynesville, Claiborne Parish.Louisiana Highway 616
Louisiana Highway 616 runs from Claiborne to West Monroe.Louisiana Highway 617
Louisiana Highway 617 runs in West Monroe.Louisiana Highway 618
Louisiana Highway 618 runs in Winnsboro.Louisiana Highway 619
Louisiana Highway 619 was a state highway that served St. Bernard Parish. It spanned in a west to east direction along the shore of Lake Borgne near what is now known as Old Shell Beach.Louisiana Highway 620
Louisiana Highway 620 runs in an east-west direction from LA 413 in Erwinville to LA 415 northwest of Port Allen, West Baton Rouge Parish.LA 620 heads due east from LA 413, just north of the latter's intersection with the concurrent US 190 and LA 1 in Erwinville. LA 620 intersects three minor state routes before terminating at LA 415 in an area known as Smithfield. LA 620 is an undivided two-lane highway for its entire length.
Before the 1955 Louisiana Highway renumbering, LA 620 was part of State Route 30.
Louisiana Highway 621
Louisiana Highway 621 runs in an east-west direction from LA 73 in Prairieville to LA 431 at Brignac, Ascension Parish.The route heads east from LA 73 adjacent to I-10 Exit 173. It crosses both US 61 and LA 44 north of Gonzales before ending at LA 431 in an area known as Brignac. LA 621 is an undivided two-lane highway for its entire length.
Louisiana Highway 622
Louisiana Highway 622 runs in Mangham.Louisiana Highway 623
Louisiana Highway 623 runs in Ball.Louisiana Highway 624
Louisiana Highway 624 runs in an east-west direction from LA 46 in Yscloskey to a point near the Mississippi River Gulf Outlet Canal east of Hopedale, St. Bernard Parish.The route heads southeast from Yscloskey, running along the north bank of Bayou La Loutre. After passing through Hopedale, LA 624 curves to the northeast with the bayou and proceeds to the end of state maintenance. A local road continues a short distance to a dead end at the Mississippi River Gulf Outlet Canal. LA 624 is an undivided two-lane highway for its entire length.
Louisiana Highway 625
Louisiana Highway 625 runs in an east-west direction along Maple Street in Yscloskey, St. Bernard Parish.The route begins at LA 46, which runs along Bayou La Loutre. It then curves to the southeast to a dead end at Bayou Yscloskey. It is an undivided, two-lane highway for its entire length.
In the pre-1955 state highway system, LA 625 was designated as State Route C-2073. LA 625 was created in the 1955 Louisiana Highway renumbering, its western end following a slightly different connection to LA 46.
Louisiana Highway 626
Louisiana Highway 626 runs in a north-south direction along St. Rose Avenue from LA 48 in St. Rose to US 61 at the northeast corner of Destrehan, St. Charles Parish.The route connects the community of St. Rose with US 61 west of New Orleans. Along its short route, LA 626 crosses both the Canadian National Railway and Kansas City Southern Railway tracks at grade. It also crosses under but does not intersect I-310. LA 626 is an undivided two-lane highway for its entire length.
Louisiana Highway 627
Louisiana Highway 627 runs in a north-south direction along Prospect Avenue in Norco, St. Charles Parish.The route connects US 61 with LA 48 in an area known as Good Hope. It travels through the Valero and Shell-Motiva oil refineries, crossing both the Canadian National Railway and Kansas City Southern Railway tracks at grade. LA 627 is an undivided two-lane highway for its entire length.
In the pre-1955 state highway system, LA 627 was designated as State Route 682. LA 627 was created in the 1955 Louisiana Highway renumbering, connecting to LA 48 at a slightly different location. In the early 2000s, the southern portion of LA 627 was re-routed from Prospect Avenue onto a parallel road formerly known as Garrison Street. The original route is now signed as "Old Prospect."
Louisiana Highway 628
Louisiana Highway 628 runs in a general east-west direction from LA 44 in LaPlace, St. John the Baptist Parish to US 61 in Montz, St. Charles Parish.The route heads southeast along East 5th Street from LA 44 in LaPlace. It approaches and begins to run alongside the east bank levee of the Mississippi River, where it becomes known as River Road. LA 628 intersects LA 636-1 and LA 3217, two short connectors to the parallel US 61. The highway then crosses from St. John the Baptist Parish into the St. Charles Parish community of Montz. Reaching the Upper Guide Levee of the Bonnet Carré Spillway, LA 628 turns away from the river and heads northeast on C.C. Road. It parallels the spillway levee to its terminus at US 61. LA 628 is an undivided two-lane highway for its entire length.
Louisiana Highway 629
Louisiana Highway 629 ran in a north–south direction along Killona Drive in Killona, St. Charles Parish.The route headed southwest from LA 18, which runs along the Mississippi River, to a crossing of the Texas & Pacific Railroad tracks on Killona Drive. It was an undivided, two-lane highway for its entire length.
In the pre-1955 state highway system, LA 629 was designated as State Route 659. LA 629 was created with the 1955 Louisiana Highway renumbering and deleted sometime in the 1960s. Today a similar route, LA 3141, parallels and extends beyond Killona Drive, connecting LA 18 with LA 3127, a bypass of LA 18 that was constructed in the 1970s.