List of Interstate Highways in Louisiana

Interstate Highways of the Louisiana Highway System
	Highway markers in use for primary interstates (left) and auxiliary interstate (right)
System information
Length:	902.84 mi (1,452.98 km)
Formed:	1957 (designated);; 1960 (signed)
Highway names
Interstates:	Interstate X (I-X)
System links
	Louisiana Highway System; Interstate; US; State;

The Interstate Highway System in Louisiana consists of 902.84 miles (1,452.98 km)^[1] of freeways constructed and maintained by the Louisiana Department of Transportation and Development (La DOTD).

Primary interstates

Number	Length (mi)^[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I0010 !I-10	274.42	441.64	Texas state line at Orange, TX	Mississippi state line east of Slidell	1960	current	Southern Louisiana's primary west–east route serving Lake Charles, Lafayette, Baton Rouge, New Orleans, and Slidell
I0012 !I-12	85.59	137.74	I-10 in Baton Rouge	I-10/I-59 in Slidell	1967^[2]	current	Northern bypass of New Orleans metropolitan area via Hammond
I0020 !I-20	189.87	305.57	Texas state line west of Greenwood	Mississippi state line at Vicksburg, MS	1960	current	Northern Louisiana's primary west–east route serving Shreveport and Monroe
I0049 !I-49	208.25	335.15	I-10/US 167 in Lafayette	I-20 in Shreveport	1983	current	Louisiana's primary north–south route, connecting I-10 and I-20 via Alexandria; extension under construction from Shreveport north to Arkansas state line
I0055 !I-55	65.81	105.91	I-10/US 51 in LaPlace	Mississippi state line north of Kentwood	1960	current	North–south route in southeastern Louisiana via Hammond
I0059 !I-59	11.48	18.48	I-10/I-12 in Slidell	Mississippi state line north of Pearl River	1960	current	North–south route in southeastern Louisiana via Slidell

Number	Length (mi)^[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I0110 !I-110	8.89	14.31	I-10 in Baton Rouge	US 61 in Baton Rouge	1960	current	Baton Rouge spur; designated as I-410 until 1965
I0210 !I-210	12.40	19.96	I-10 west of Lake Charles	I-10 east of Lake Charles	1964	current	Lake Charles downtown bypass
I0220 !I-220	17.62	28.36	I-20/LA 3132 in Shreveport	I-20 in Bossier City	1979	current	Shreveport–Bossier City downtown bypass
I0310 !I-310	11.25	18.11	US 90/LA 3127 in Boutte	I-10 west of Kenner	1983	current	Spur west of New Orleans
I0510 !I-510	3.04	4.89	LA 47 in New Orleans	I-10/LA 47 in New Orleans	1992	current	Spur in Eastern New Orleans
I0610 !I-610	4.52	7.27	I-10 in New Orleans		1965	current	New Orleans downtown bypass
I0910 !I-910	9.70	15.61	US 90 Bus. in Marrero	I-10/US 90 Bus. in New Orleans	1999	current	FHWA designation (not used by La DOTD) for freeway portion of US 90 Business and placeholder for future I-49 corridor

Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Proposed	Cancelled	Notes
I‑14	–	–	Alexandria (undecided)	Mississippi state line at Natchez, MS (undecided)	2005	–	Proposed new route roughly paralleling the existing US 84 corridor
I-69	100	160	Texas state line southwest of Shreveport (undecided)	Arkansas state line northeast of Haynesville (undecided)	1991	–	Proposed extension roughly paralleling the existing US 79 corridor
I-310	2.70	4.35	US 90 Bus. in New Orleans	I-10 in New Orleans	1964	1969	Cancelled Vieux Carré Riverfront Expressway
I-410	–	–	West of Baton Rouge	Baton Rouge	1965	1969	Cancelled northern bypass of Baton Rouge using part of Airline Highway corridor
I-410	–	–	I-10 west of New Orleans	I-10 in Eastern New Orleans	1969	1977	Cancelled southern bypass of New Orleans known as the Dixie Freeway; partially built as current I-310 and I-510
I-420	10.20	16.42	I-20 near Monroe	I-20 near Monroe	1959	1964	Cancelled two-lane bypass of Monroe

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