The following is a list ofstate highways in theU.S. state ofLouisiana designated in the 550-599 range.

Louisiana Highway 550
Location	Union Parish
Length	18.89 mi[1] (30.40 km)
Existed	1955–present

Louisiana Highway 550 (LA 550) runs 18.89 miles (30.40 km) in a north–south direction fromLA 2 east ofBernice to theArkansas state line north ofLaran,Union Parish.^[2]

The route heads northeast from LA 2 and intersectsLA 15 southeast ofSpearsville. LA 550 then curves northward and passes through Laran before crossing the Arkansas state line. The road continues towardHillsboro, Arkansas andUS 82 asUnion County Road 32. It is an undivided two-lane highway for its entire length.^[2][3][4]

The entire route is inUnion Parish.

mi[1]	km	Destinations	Notes
0.0	0.0	LA 2 –Bernice,Farmerville	Southern terminus
10.0	16.1	LA 15 –Spearsville,Farmerville
18.9	30.4	CR 32 (Hillsboro Road) –Hillsboro	Northern terminus; continuation inArkansas
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 551
Location	Marion–Oakland
Length	9.33 mi[1] (15.02 km)
Existed	1955–present

Louisiana Highway 551 (LA 551) runs 9.33 miles (15.02 km) in a north–south direction fromLA 33 inMarion toLA 549 inOakland,Union Parish.^[5]

The route heads northwest out of Marion, traversing a rural area and skirting the northeast side of theUnion Wildlife Management Area. Its northern terminus at LA 549 is located 1.08 miles (1.74 km) south of theArkansas state line. LA 551 is an undivided two-lane highway for its entire length.^[4][5][6]

Louisiana Highway 552
Location	Union Parish
Length	12.27 mi[1][7] (19.75 km)

Louisiana Highway 552 (LA 552) runs 12.27 miles (19.75 km) inUnion Parish.

Louisiana Highway 553
Location	Monroe–Sterlington
Length	12.82 mi[1] (20.63 km)
Existed	1955–present

Louisiana Highway 553 (LA 553) runs 12.82 miles (20.63 km) in a north–south direction fromUS 165 inMonroe toLA 2 inSterlington,Ouachita Parish.^[8]

Louisiana Highway 554
Location	Perryville–Collinston
Length	8.02 mi[1] (12.91 km)
Existed	1955–present

Louisiana Highway 554 (LA 554) runs 8.02 miles (12.91 km) in an east–west direction from a junction withUS 165 andLA 2 atPerryville toLA 138 southwest ofCollinston.^[9]

The western terminus at US 165 and LA 2 is located on the Ouachita–Morehouse parish line. From this point, the route heads eastward throughOuachita Parish for 2.6 miles (4.2 km) before crossingLittle Bayou Boeuf intoMorehouse Parish. LA 554 intersectsLA 139, which connects toMonroe andBastrop. It continues eastward then makes a sharp curve to the south near its eastern terminus at LA 138. LA 554 is an undivided two-lane highway for its entire length.^{[4][9][10][11]}

Parish	Location	mi[1]	km	Destinations	Notes
Ouachita–Morehouse parish line	Perryville	0.0	0.0	US 165 /LA 2 –Monroe,Bastrop	Western terminus
Morehouse	​	4.9	7.9	LA 139 (Old Monroe Road) –Monroe,Bastrop
	​	8.0	12.9	LA 138 (Doss Highway) –Collinston,Monroe	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 555
Location	Franklin Parish
Length	12.38 mi[1][12] (19.92 km)

Louisiana Highway 555 (LA 555) runs 12.38 miles (19.92 km) inFranklin Parish.

Louisiana Highway 556
Location	Choudrant–Indian Village
Length	8.05 mi[1][13] (12.96 km)

Louisiana Highway 556 (LA 556) runs 8.05 miles (12.96 km) fromChoudrant toIndian Village.

Louisiana Highway 557
Location	Vixen–Summit
Length	14.72 mi[1][14] (23.69 km)

Louisiana Highway 557 (LA 557) runs 14.72 miles (23.69 km) fromVixen toSummit.

Louisiana Highway 558
Location	Mount Union–Lockhart
Length	5.94 mi[1] (9.56 km)
Existed	1955–present

Louisiana Highway 558 (LA 558) runs 5.94 miles (9.56 km) in a north–south direction along Iron Mountain Road fromLA 15 inMount Union to theArkansas state line atLockhart,Union Parish.^[15]

The route heads north from LA 15 at a point about 2.0 miles (3.2 km) east ofSpearsville. Just before crossing the state line, LA 558 intersectsLA 3121 in Lockhart. It continues towardEl Dorado, Arkansas andUS 167 asArkansas Highway 7. LA 558 is an undivided two-lane highway for its entire length.^[3][4][15]

The entire highway is inUnion Parish.

Location	mi[1]	km	Destinations	Notes
Mount Union	0.0	0.0	LA 15 –Spearsville,Farmerville	Southern terminus
Lockhart	5.6	9.0	LA 3121 –Taylortown	Northern terminus of LA 3121
	6.0	9.7	AR 7 north –El Dorado	Northern terminus; continuation inArkansas
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 559
Location	Enterprise–Columbia
Length	13.83 mi[1][16] (22.26 km)

Louisiana Highway 559 (LA 559) runs 13.83 miles (22.26 km) fromEnterprise toColumbia.

Louisiana Highway 560
Location	Jefferson Parish
Length	1.03 mi[1] (1.66 km)
Existed	1955–present

Louisiana Highway 560 (LA 560) is a collection of two current and two former state-maintained streets inMarrero andCrown Point,Jefferson Parish. All four routes were established with the1955 Louisiana Highway renumbering.

Louisiana Highway 561
Location	Hebert–Richland Parish
Length	11.78 mi[1][17] (18.96 km)

Louisiana Highway 561 (LA 561) runs 11.78 miles (18.96 km) fromHebert toRichland Parish.

Louisiana Highway 562
Location	Fort Necessity–Wisner
Length	26.80 mi[1][18] (43.13 km)

Louisiana Highway 562 (LA 562) runs 26.80 miles (43.13 km) fromFort Necessity toWisner.

Louisiana Highway 563
Location	Simsboro
Length	13.38 mi[1][19] (21.53 km)

Louisiana Highway 563 (LA 563) runs 13.38 miles (21.53 km) inSimsboro.

Louisiana Highway 564
Location	Catahoula Parish
Length	4.86 mi[1][20] (7.82 km)

Louisiana Highway 564 (LA 564) runs 4.86 miles (7.82 km) inCatahoula Parish.

Louisiana Highway 565
Location	Wildsville–Deer Park
Length	28.54 mi[1][21] (45.93 km)

Louisiana Highway 565 (LA 565) runs 28.54 miles (45.93 km) fromWildsville to Deer Park.

Louisiana Highway 566
Location	Elkhorn–Clayton
Length	30.09 mi[1] (48.43 km)
Existed	1955–present

Louisiana Highway 566 (LA 566) runs 30.09 miles (48.43 km) in a southwest to northeast direction fromUS 84 atElkhorn,Concordia Parish to a junction withLA 568 andLA 570 south ofWaterproof,Tensas Parish.^[22]

The route heads northward from US 84 and followsBrushy Bayou for about 3.0 miles (4.8 km). It then curves slightly northeast to a point on theTensas River known asDunbarton. LA 566 turns east and roughly follows the river into the town ofClayton. Here, it intersects the concurrentUS 425 andLA 15 at the foot of a twin bridge across the Tensas River. LA 566 curves to the north with the river and crosses from Concordia Parish into Tensas Parish.^[22][23][24]

Soon after crossing the parish line, LA 566 intersectsLA 571, the route of which follows a semi-circle west ofWaterproof. LA 566 turns to the southeast at a second intersection with LA 571 and passes throughTroy to a point onUS 65 and LA 568 just southwest of Waterproof. LA 566 officially proceeds with LA 568 a short distance further to an intersection with LA 570, but this portion of the route is signed in the field only as LA 568.^[22][24][25]

Louisiana Highway 567
Location	Lee Bayou
Length	3.26 mi[1][26] (5.25 km)

Louisiana Highway 567 (LA 567) runs 3.26 miles (5.25 km) inLee Bayou.

Louisiana Highway 568
Location	Ferriday–Avondale
Length	32.5 mi[1][27] (52.3 km)

Louisiana Highway 568 (LA 568) runs 32.5 miles (52.3 km) fromFerriday toAvondale.

Louisiana Highway 569
Location	Spokane–Lake St. John
Length	12.24 mi[1][28] (19.70 km)

Louisiana Highway 569 (LA 569) runs 12.24 miles (19.70 km) fromSpokane toLake St. John.

Louisiana Highway 570
Location	Waterproof
Length	4.16 mi[1][29] (6.69 km)

Louisiana Highway 570 (LA 570) runs 4.16 miles (6.69 km) inWaterproof.

Louisiana Highway 571
Location	Tensas Parish
Length	12.13 mi[1] (19.52 km)
Existed	1955–present

Louisiana Highway 571 (LA 571) runs 12.13 miles (19.52 km) in a southwest to northeast semi-circle fromLA 566 north ofClayton to a second junction with LA 566 west ofWaterproof,Tensas Parish.^[30]

Louisiana Highway 572
Location	Gilbert–Talbot Landing
Length	10.33 mi[1][31] (16.62 km)

Louisiana Highway 572 (LA 572) runs 10.33 miles (16.62 km) fromGilbert toTalbot Landing.

Louisiana Highway 573
Location	Goldman–Saranac
Length	21.35 mi[1][32] (34.36 km)

Louisiana Highway 573 (LA 573) runs 21.35 miles (34.36 km) fromGoldman toSaranac.

Louisiana Highway 574
Location	Grand Isle
Length	2.72 mi[1] (4.38 km)
Existed	1955–present

Louisiana Highway 574 (LA 574) runs 2.72 miles (4.38 km) inGrand Isle.

Louisiana Highway 575
Location	Newellton–Somerset
Length	14.82 mi[1][33] (23.85 km)

Louisiana Highway 575 (LA 575) runs 14.82 miles (23.85 km) fromNewellton toSomerset.

Louisiana Highway 576
Location	Charlieville–Mangham
Length	17.08 mi[1][34] (27.49 km)

Louisiana Highway 576 (LA 576) runs 17.08 miles (27.49 km) fromCharlieville toMangham.

Louisiana Highway 577
Location	Baskin–Darnell
Length	61.20 mi[1][35] (98.49 km)

Louisiana Highway 577 (LA 577) runs 61.20 miles (98.49 km) fromBaskin toDarnell.^[36]

Louisiana Highway 578
Location	Crowville
Length	7.71 mi[1][37] (12.41 km)

Louisiana Highway 578 (LA 578) runs 7.71 miles (12.41 km) fromCrowville.

Louisiana Highway 579
Location	Waverly–Monticello
Length	12.86 mi[1][38] (20.70 km)

Louisiana Highway 579 (LA 579) runs 12.86 miles (20.70 km) fromWaverly toMonticello.

Louisiana Highway 580
Location	Monticello–Alsatia
Length	12.30 mi[1][39] (19.79 km)

Louisiana Highway 580 (LA 580) runs 12.30 miles (19.79 km) fromMonticello toAlsatia.

Louisiana Highway 581
Location	Waddell–Transylvania
Length	6.94 mi[1][40] (11.17 km)

Louisiana Highway 581 (LA 581) runs 6.94 miles (11.17 km) fromWaddell toTransylvania.

Louisiana Highway 582
Location	Redwing–Lake Providence
Length	16.93 mi[1][41] (27.25 km)

Louisiana Highway 582 (LA 582) runs 16.93 miles (27.25 km) fromRedwing toLake Providence.

Louisiana Highway 583
Location	Bee Bayou–Hegwood Island
Length	10.47 mi[1][42] (16.85 km)

Louisiana Highway 583 (LA 583) runs 10.47 miles (16.85 km) fromBee Bayou toHegwood Island.

Louisiana Highway 584
Location	Richland Parish
Length	8.01 mi[1] (12.89 km)
Existed	1955–present

Louisiana Highway 584 (LA 584) runs 8.01 miles (12.89 km) in an east–west direction fromLA 135 to a point just east ofLA 3048 in an area south ofRayville,Richland Parish.^[43]

Louisiana Highway 585
Location	Richland Parish–Gassoway
Length	46.48 mi[1] (74.80 km)
Existed	1955–present

Louisiana Highway 585 (LA 585) runs 46.48 miles (74.80 km) in a southwest to northeast direction fromLA 134 west ofEpps,Richland Parish toUS 65 atGassoway,East Carroll Parish.^[44]

The route heads due north from LA 134 and crosses from Richland Parish intoWest Carroll Parish.^[4][44][45] It then zigzags northward acrossLA 2 atGoodwill to a point on theBoeuf River west ofOak Grove. It then zigzags east and north toFiske, where it begins to take a winding course parallel to the Boeuf River toLA 835 nearConcord. LA 585 curves eastward toKilbourne, where it intersectsLA 17 just south of theArkansas state line.^[4][44][46] The highway proceeds east acrossBayou Macon into East Carroll Parish to its terminus at US 65 nearGassoway Lake.^[4][44][47]

Louisiana Highway 586
Location	Concord–Terry
Length	7.00 mi[1][48] (11.27 km)

Louisiana Highway 586 (LA 586) runs 7.00 miles (11.27 km) fromConcord toTerry.

Louisiana Highway 587
Location	Oak Grove
Length	4.63 mi[1][49] (7.45 km)

Louisiana Highway 587 (LA 587) runs 4.63 miles (7.45 km) inOak Grove.

Louisiana Highway 588
Location	East Carroll Parish
Length	17.40 mi[1][50] (28.00 km)

Louisiana Highway 588 (LA 588) runs 17.40 miles (28.00 km) inEast Carroll Parish.

Louisiana Highway 589
Location	East Carroll Parish
Length	12.99 mi[1][51] (20.91 km)

Louisiana Highway 589 (LA 589) runs 12.99 miles (20.91 km) inEast Carroll Parish.

Louisiana Highway 590
Location	Morehouse Parish
Length	5.85 mi[1][52] (9.41 km)

Louisiana Highway 590 (LA 590) runs 5.85 miles (9.41 km) inMorehouse Parish.

Louisiana Highway 591
Location	Morehouse Parish
Length	9.04 mi[1][53] (14.55 km)

Louisiana Highway 591 (LA 591) runs 9.04 miles (14.55 km) inMorehouse Parish.

Louisiana Highway 592
Location	Bastrop
Length	3.88 mi[1][54] (6.24 km)

Louisiana Highway 592 (LA 592) runs 3.88 miles (6.24 km) inBastrop.

Louisiana Highway 593
Location	Collinston–Bastrop
Length	17.23 mi[1] (27.73 km)
Existed	1955–present

Louisiana Highway 593 (LA 593) runs 17.23 miles (27.73 km) in a north–south direction fromLA 138 inCollinston toUS 425 north ofBastrop.^[55]

The route heads northwest from Collinston and shortly intersectsLA 3079. It travels through sparsely populated areas until passing just west of the Morehouse Memorial Airport, entering the city of Bastrop. LA 593 intersectsLA 139, and the two highways run concurrently into the center of town, becoming a one-way couplet at the Morehouse General Hospital. A few blocks later, LA 593 intersects the one-way couplet ofUS 165/US 425/LA 2, ending its concurrency with LA 139 and beginning one with US 425. The one-way couplet ends two blocks to the north, and LA 593 splits from US 425 soon afterward. North of town, LA 593 passes by the Morehouse Country Club, the Georgia Pacific Wildlife Management Area, and Bussy Brake, all to the west of the road. LA 593 loops back to the east and ends at a final junction with US 425.

The entire highway is inMorehouse Parish.

Location	mi[55]	km	Destinations	Notes
Collinston	0.0	0.0	LA 138	Southern terminus
​	1.4	2.3	LA 3079	Western terminus of LA 3079
Bastrop	5.2	8.4	LA 830-5	Southern terminus of LA 830-5
	5.8	9.3	LA 139 south	South end of LA 139 concurrency
	6.8	10.9	US 165 /US 425 south /LA 2 /LA 139	North end of LA 139 concurrency; south end of US 425 concurrency
	7.2	11.6	LA 830-1	Eastern terminus
	7.7	12.4	US 425 north	North end of US 425 concurrency
​	17.4	28.0	US 425	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

Louisiana Highway 594
Location	Monroe–Swartz
Length	13.54 mi[1] (21.79 km)
Existed	1955–present

Louisiana Highway 594 (LA 594) runs 13.54 miles (21.79 km) in a general southwest to northeast direction fromLA 15 inMonroe toLA 139 inSwartz,Ouachita Parish.^[56]

LA 594 initially heads northeast on Texas Avenue from LA 15, near the latter's intersection withUS 165 Business. The highway crosses overI-20 and immediately intersects 18th Street, connecting to a tightdiamond interchange with the interstate. LA 594 turns to the east parallel with I-20 and intersects mainlineUS 165 near thePecanland Mall. After a few miles, LA 594 reachesMillhaven and turns due north. It intersectsUS 80 as it passes Ouachita Parish High School and continues north through Swartz to its terminus at LA 139.

LA 594 is an undivided two-lane highway for its entire length.

The entire highway is inOuachita Parish.

Location	mi[56]	km	Destinations	Notes
Monroe	0.0	0.0	LA 15	Southwestern terminus
	0.6– 0.9	0.97– 1.4	ToI-20 –Shreveport,Vicksburg via 18th Street	Exit 117B on I-20
	1.8	2.9	US 165
​	9.2	14.8	US 80
Swartz	13.5	21.7	LA 139	Northeastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 595
Location	Richland Parish
Length	3.41 mi[1] (5.49 km)
Existed	1955–present

Louisiana Highway 595 (LA 595) runs 3.41 miles (5.49 km) in a north–south direction from a junction withUS 80 andLA 133 inStart to the Richland–Morehouse parish line.^[57]

The route heads north from the concurrent US 80 and LA 133 in Start, a small community in northwesternRichland Parish. After curving westward, LA 595 turns north at a T-intersection with a local road. State maintenance ends at a bridge overBayou Lafourche, which forms the boundary between Richland Parish andMorehouse Parish. LA 595 is an undivided two-lane highway for its entire length.^[4][57][58]

The entire highway is inRichland Parish.

Location	mi[1]	km	Destinations	Notes
Start	0.0	0.0	US 80 /LA 133 –Monroe,Tallulah	Southern terminus
​	3.4	5.5	End state maintenance atBayou Lafourche bridge	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 596
Location	Lake Providence–Panola
Length	10.70 mi[1] (17.22 km)
Existed	1955–present

Louisiana Highway 596 (LA 596) runs 10.70 miles (17.22 km) in a north–south direction fromUS 65 inLake Providence to a second junction with US 65 atPanola,East Carroll Parish.^[59]

Louisiana Highway 597
Location	Forest
Length	2.04 mi[1][60] (3.28 km)

Louisiana Highway 597 (LA 597) runs 2.04 miles (3.28 km) inForest.

Louisiana Highway 599
Location	Morehouse Parish
Length	13.14 mi[1][61] (21.15 km)

Louisiana Highway 599 (LA 599) runs 13.14 miles (21.15 km) inMorehouse Parish.

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