Interstate 405
San Diego Freeway
I-405 highlighted in red
Route information
Auxiliary route of I-5
Maintained by Caltrans
Length	72.415 mi[1] (116.541 km)
Existed	1964–present
NHS	Entire route
Major junctions
South end	I-5 in Irvine
Major intersections	SR 133 in Irvine SR 55 / SR 73 in Costa Mesa I-605 / SR 22 in Seal Beach I-710 in Long Beach I-110 in Carson I-105 near LAX I-10 in West Los Angeles SR 2 in Westwood US 101 in Sherman Oaks SR 118 in Mission Hills
North end	I-5 near San Fernando
Location
Country	United States
State	California
Counties	Orange, Los Angeles
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← US 395 US 466 →

Interstate 405 (I-405) is an Interstate Highway in the Orange and Los Angeles counties of California. It is a bypass route of the Interstate 5. It goes from the I-5 near San Fernando, through the west side of Los Angeles and Long Beach before ending back at the Interstate 5 near Irvine. It is the busiest highway in the United States, mainly because it is the only highway in the west side of Los Angeles that goes from north to south. It also passes important places such as Los Angeles International Airport and the ports of Los Angeles and Long Beach. It also forms a western bypass around Center Los Angeles.^[2][3][4]

Except when a letter is put before it, postmiles were measured on the road as it was in 1964, based on how it was at the time, and do not necessarily show the current mileage. R reflects a change in the route since then, M indicates a second change, L refers an overlap because of a correction or change, and T indicates postmiles that were temporary (for a full list of prefixes, see the list of postmile definitions).^[1] Segments that have not been built or are now controlled locally may be left out. The numbers start again at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile [1][5][6]	Exit [7]	Destinations	Notes
Orange ORA 0.23–24.18	Irvine	0.23		I-5 south (San Diego Freeway south)  – San Diego	Southern terminus; former US 101 south; no access to I-5 north; I-5 exit 94A
		​	1A	Lake Forest Drive	No northbound exit
		​	1B	Bake Parkway	No northbound exit
		0.95	1C	Irvine Center Drive	Signed as exit 1 northbound
		​	—	I-5 south	HOV access only; southbound exit and northbound entrance
		1.80	2	SR 133 (Laguna Freeway) to toll road – Laguna Beach	No northbound exit to SR 133 north; SR 133 exit 8
		2.88	3	Shady Canyon Drive / Sand Canyon Avenue
		3.95	4	Jeffrey Road / University Drive
		5.62	5	Culver Drive
		6.92	7	Jamboree Road
		7.80	8	MacArthur Boulevard – John Wayne Airport
	Costa Mesa	8.74	9A	SR 55 (Costa Mesa Freeway)	SR 55 north exit 6, south exits 6A-B
		​	—	SR 55 north	HOV access only
		​	9B	Anton Boulevard / Avenue of the Arts	Northbound exit and entrance
		9.51	9B	Bristol Street
		10.28	10	SR 73 south (Corona del Mar Freeway) to SR 55 south (Costa Mesa Freeway)  – San Diego via toll road	Southbound exit and northbound entrance
		​	11	South Coast Drive	Northbound exit only
		10.75	11A	Fairview Road	Signed as exit 11 northbound
		11.45	11B	Harbor Boulevard – Costa Mesa	Signed as exit 11 northbound
	Fountain Valley	12.47	12	Euclid Street / Newhope Street / Ellis Avenue
		13.78	14	Brookhurst Street – Fountain Valley
		14.82	15A	Warner Avenue east	Southbound exit and northbound entrance
	Huntington Beach	15.21	15B	Magnolia Street / Warner Avenue west	Signed as exit 15 northbound
		16.54	16	SR 39 (Beach Boulevard)  – Westminster, Huntington Beach
	Westminster	17.75	18	Bolsa Avenue / Goldenwest Street	Goldenwest Street is signed as Golden West St.
		19.16	19A-B	Westminster Boulevard / Springdale Street
		20.56	20	Bolsa Chica Road / Valley View Street	Southbound exit and entrance only
		20.75	21	SR 22 east (Garden Grove Freeway)  – Garden GroveModule:Jct warning: "road" parameter is deprecated	Southern end of SR 22 concurrency, Valley View St. not signed southbound
		​	—	SR 22 east	HOV access only; southbound exit and northbound entrance
	Seal Beach	22.64	22	Seal Beach Boulevard / Los Alamitos Boulevard	Former SR 35
		23.28	23	SR 22 west  – Long Beach	Northern end of SR 22 concurrency; northbound exit and southbound entrance; I-605 exit 1A
		​	—	I-605 north	HOV access only; northbound exit and southbound entrance
Orange–Los Angeles county line	Seal Beach–Long Beach line	23.28	23	SR 22 west (7th Street)  – Long Beach	Southbound exit and northbound entrance; SR 22 exit 2, I-605 south exit 1A
		24.04	24A	I-605 north (San Gabriel River Freeway)	Signed as exit 24 northbound; I-605 north exit 1A, south exits 1B-C; SR 22 exit 2
		0.00– 0.03	San Gabriel River
Los Angeles LA 0.00–48.64	Long Beach	0.45	24B	Studebaker Road	Southbound exit and northbound entrance
		1.11	25	Palo Verde Avenue
		1.64	26A	Woodruff Avenue	No southbound exit
		2.18	26B	Bellflower Boulevard	Signed as exit 26 southbound
		3.32	27	SR 19 (Lakewood Boulevard)  – Long Beach Airport
		4.88	29	Spring Street / Cherry Avenue – Signal Hill	Signed as exits 29A (south) and 29B (north)
	Signal Hill	5.39	29C	Orange Avenue
	Long Beach	6.08	30A	Atlantic Avenue
		6.34	30B	Long Beach Boulevard	Former SR 15
		6.70	32A	Pacific Avenue	Southbound exit and northbound entrance
		7.60	32	I-710 (Long Beach Freeway)  – Long Beach, Pasadena	Signed as exits 32A (north) and 32B (south) northbound, and 32B (south) and 32C (north) southbound; I-710 exit 4
		8.06	32C	Hughes Way / Santa Fe Avenue	Signed as exit 32D southbound
	Carson	8.78	33A	Alameda Street (SR 47 south)
		9.56	33B	Wilmington Avenue
		10.54	34	Carson Street
		11.22	35	Avalon Boulevard – Carson	Northbound exit to Avalon Boulevard south is via exit 34.
		12.60	36	Main Street	Northbound exit and southbound entrance
		12.97	37A	I-110 (Harbor Freeway)  – San Pedro, Los Angeles	Signed as exit 37 northbound; former US 6; I-110 exit 9
	Los Angeles	13.28	37B	Vermont Avenue	Southbound exit and northbound entrance
		13.83	38A	Normandie Avenue – Gardena
		14.40	38B	Western Avenue
	Torrance	15.45	39	Crenshaw Boulevard – Torrance
		16.57	40	To SR 91Module:Jct warning: "road" parameter is deprecated	Signed as exit 40A southbound; former SR 91
		16.88	40B	Redondo Beach Boulevard – Redondo Beach	Southbound exit and northbound entrance
	Lawndale	17.59	42A	SR 107 (Hawthorne Boulevard)  – Lawndale
	Redondo Beach	18.23	42B	Inglewood Avenue
	Hawthorne	19.21	43	Rosecrans Avenue – Manhattan Beach	Signed as exits 43A (east) and 43B (west) southbound
		20.22	44	El Segundo Boulevard – El Segundo
	Los Angeles	R21.18	45A	I-105 (Century Freeway)  – El Segundo, Norwalk	Signed as exit 45 southbound; serves Los Angeles International Airport; I-105 east exit 2, west exit 2B
		R21.22	45B	Imperial Highway	Southbound exit is part of exit 46.
	Inglewood	22.22	46	Century Boulevard – LAX Airport
		23.36	47	Manchester Boulevard / La Cienega Boulevard / Florence Avenue	Manchester Boulevard was former SR 42.
	Los Angeles	24.27	48	La Tijera Boulevard
		24.56	49A	Howard Hughes Parkway / Sepulveda Boulevard	Signed as exit 49 southbound
	Culver City	25.46	49B	Sepulveda Boulevard / Slauson Avenue (SR 90 east)	Northbound exit only; SR 90 exit 2
		25.95	50A	Jefferson Boulevard	Signed as exit 50B northbound
		25.95	50B	SR 90 (Marina Freeway)  – Marina del ReyModule:Jct warning: "road" parameter is deprecated	Signed as exit 50A northbound; no access from I-405 north to SR 90 east; SR 90 exit 2
		27.20	51	Culver Boulevard / Washington Boulevard – Culver City
		27.96	52	Venice Boulevard (SR 187) / Washington Boulevard
	Los Angeles	29.16	53A	National Boulevard	Northbound exit and southbound entrance
		29.54	53B	I-10 (Santa Monica Freeway)  – Santa Monica, Los Angeles	Signed as exit 53 southbound; I-10 exits 3A-B
		30.18	54	Olympic Boulevard / Pico Boulevard	Southbound exit and northbound entrance; former SR 26
		30.86	55A	SR 2 (Santa Monica Boulevard)	Former US 66
		31.54	55B	Wilshire Boulevard	Signed as exits 55B (east) and 55C (west) southbound
		32.50	56	Montana Avenue	Northbound exit only; demolished[8]
		33.00	57A	Sunset Boulevard	Signed as exit 57 southbound
		33.29	57B	Moraga Drive	Northbound exit and entrance
		34.76	59	Getty Center Drive
		36.03	61	Mulholland Drive / Skirball Center Drive
	Sherman Oaks, Los Angeles	39.00	63A	Ventura Boulevard / Sepulveda Boulevard / Valley Vista Boulevard
		39.43	63B	US 101 (Ventura Freeway)  – Ventura, Los Angeles	US 101 exit 19A
		40.29	64	Burbank Boulevard
	Van Nuys, Los Angeles	41.36	65	Victory Boulevard – Van Nuys
		42.36	66	Sherman Way – Van Nuys Airport	Signed as exits 66A (east) and 66B (west) northbound
	North Hills, Los Angeles	43.76	68	Roscoe Boulevard – Panorama City
		44.74	69	Nordhoff Street
	Mission Hills, Los Angeles	46.24	70	Devonshire Street – Granada Hills
		46.85	71A	SR 118 (Ronald Reagan Freeway)  – Simi Valley	Signed as exit 71 southbound; no southbound exit to SR 118 east or northbound entrance from SR 118 west; SR 118 east exit 42A, west exit 42B
		47.24	71B	San Fernando Mission Boulevard	Northbound exit and southbound entrance
		47.75	72	Rinaldi Street – Mission Hills
		48.64		I-5 north (Golden State Freeway)  – Sacramento	Northern terminus; no access to I-5 south; I-5 exit 158
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Closed/former       Concurrency terminus       HOV only       Incomplete access