California Interstate Map

About California Interstate Map

This Interstate Highways map of California shows all the interstates highway routes in the state of California of the United States with major cities and state capital Sacramento.

Interstate Highways of California

Primary Interstate Highways

Highway Number	Length in km	Length in mi	Southern or Western Terminus	Northern or Eastern Terminus	Formed
I-5	1,281.73	796.432	Mexican border in San Ysidro, San Diego	I-5 at the Oregon state line	1947
I-7	486	302	I-5 at Wheeler Ridge	I-5 in Stockton	proposed
I-8	276.77	171.98	Nimitz Boulevard, Sunset Cliffs Boulevard in San Diego	I-8 at the Arizona state line	1964
I-9	486	302	I-5 at Wheeler Ridge	I-5 in Stockton	proposed
I-10	391.57	243.31	SR 1 in Santa Monica	I-10 at the Arizona state line	1947
I-15	462.3	287.26	I-8 in San Diego	I-15 at the Nevada state line	1957
I-40	248.842	154.623	I-15 in Barstow	I-40 at the Arizona state line	1947
I-80	330.03	205.07	US 101 in San Francisco	I-80 at the Nevada state line	1947

Auxiliary Interstate Highways

Number	Length in mi	Length in km	Southern or Western Terminus	Northern or Eastern Terminus	Formed
I-105	18.82	30.29	SR 1 in El Segundo	I-605 in Norwalk	1982
I-110	23.73	38.19	SR 47 in San Pedro	I-10 in Los Angeles	1978
I-205	12.973	20.878	I-580 near Tracy	I-5 near Manteca	1970
I-210	44.9	72.26	I-5 in Los Angeles	SR 57 in Glendora	1964
I-215	55.06	88.61	I-15 in Murrieta	I-15 in San Bernardino	1982
I-238	2.126	3.421	I-580 in Castro Valley	I-880 in San Leandro	1983
I-280	57.51	92.553	US 101/I-680 in San Jose	King and 5th Streets in San Francisco	1955
I-305	5.64	9.08	I-80 in West Sacramento	SR 99 in Sacramento	1981
I-380	1.67	2.69	I-280 in San Bruno	US 101 in South San Francisco	1964
I-405	72.415	116.541	I-5 in Irvine	I-5 near San Fernando	1964
I-505	32.99	53.09	I-80 in Vacaville	I-5 near Dunnigan	1977
I-580	75.55	121.586	US 101 in San Rafael	I-5 near Tracy	1947
I-605	27.4	44.1	I-405/SR 22 in Seal Beach	I-210 in Irwindale	1964
I-680	70.536	113.517	US 101/I-280 in San Jose	I-80 in Fairfield	1976
I-710	24.249	39.025	SR 47 in Long Beach	Valley Boulevard in Alhambra	1984
I-780	6.759	10.878	I-80 in Vallejo	I-680 in Benicia	1976
I-805	28.016	45.087	I-5 in San Ysidro, San Diego	I-5 in Sorrento Valley, San Diego	1959
I-880	45.698	73.544	I-280/SR 17 in San Jose	I-80/I-580 in Oakland	1984
I-905	8.964	14.426	I-5 in San Diego	Mexican border near Otay Mesa	proposed
I-980	2.027	3.262	I-880 in Oakland	I-580/SR 24 in Oakland	1981

Business Routes

Number	Length (mi)	Length (km)	Southern or Western Terminus	Northern or Eastern Terminus	Formed
I-5 BL	-	-	I-5 in San Diego	I-5 in Oceanside	c. 1960
I-5 BL	1.1	1.8	I-5 in Arbuckle	I-5 in Arbuckle	-
I-5 BL	-	-	I-5 in Williams	I-5 in Maxwell	-
I-5 BL	-	-	I-5 in Willows	I-5 in Orland	-
I-5 BL	4.2	6.8	I-5 in Red Bluff	I-5 in Red Bluff	-
I-5 BL	3.7	6	I-5 in Dunsmuir	I-5 in Dunsmuir	-
I-5 BL	3.8	6.1	I-5 in Mount Shasta	I-5 in Mount Shasta	-
I-5 BL	-	-	I-5 in Weed	I-5 in Weed	-
I-5 BL	-	-	I-5 in Yreka	I-5 in Yreka	-
I-8 BL	8.15	13.12	I-8 in El Cajon	I-8 in Lakeside	-
I-8 BL	4.25	6.84	I-8 in Alpine	I-8 in Alpine	-
I-8 BL	4.25	6.84	I-8 in El Centro	I-8 in El Centro	-
I-8 BL	2.18	3.51	I-8 in Alpine	Bus.I-8 in Yuma, AZ	-
I-10 BL	7.9	12.7	I-10 in Blythe	I-10 in Blythe	-
I-15 BL	-	-	I-15 in Escondido	I-15 in Escondido	-
I-15 BL	-	-	I-15 in Lake Elsinore	I-15 in Lake Elsinore	-
I-15 BL	-	-	I-15 in Norco	I-15 in Norco	-
I-15 BL	-	-	I-15 in Victorville	I-15 in Victorville	-
I-15 BL	-	-	I-15 in Barstow	I-15 in Barstow	-
I-15 BL	3.6	5.8	I-15 in Baker	I-15 in Baker	-
I-40 BL	3.4	5.5	I-40 in Needles	I-40 in Needles	-
I-80 BL	13.82	22.24	I-80 in West Sacramento	I-80 in Sacramento	c. 1980
I-205 BL	-	-	I-205 in Tracy	I-5 in Lathrop	-

Throughout California, highways stand like essential pathways linking far-flung areas - each busy with daily movement. By 2026 figures, the state holds about 2,460 miles under the label "interstate," a length unmatched across contiguous U.S. territories when using current FHWA numbers plus updates from Caltrans. Not just lines on a map or pipes made of asphalt, these routes shape real lives: workers crawling toward job sites during heavy morning jams in L.A., big rigs moving fresh farm goods toward Long Beach terminals, relatives making weekend trips from SD up to Sac, travelers pausing at beach edges to watch sky turn pink over waves. Back then, during the 1950s and 1960s, the highway network took shape under the Federal-Aid Highway Act. Since then, changes have unfolded - roads have stretched farther, grown busier, shifted toward faster systems. Today’s version runs alongside California’s rapid population rise, now close to 39.5 million people sharing space along its lanes.

The North-South Backbone: Interstate 5

Starting at the Mexican border in San Ysidro, Interstate 5 stretches 796 miles straight up to nearly Yreka in Oregon, marking California’s clear central route. Heavy usage makes it stand out across state highways - this stretch sees far more movement than most others. Through Southern California, sheer volume hits over 400,000 cars daily near urban cores, data from 2025 shows. That stretch alone ranks among the densest lanes nationwide. People living in the San Fernando Valley often rely on this road to reach office work downtown. Others from the Central Valley use it to reach Sacramento quickly - just a short trip from Bakersfield. For big rigs, the route carries massive amounts of freight every single day. Changes lately, such as new express lanes added near where I-5 and I-405 meet, plus a broader upgrade along the Grapevine stretch finished in 2024, along with steady upgrades in traffic management systems, have eased heavy slowdowns somewhat. Still, gridlock shows up again and again for large numbers of drivers.

East-West Lifelines: I-10, I-80, and I-40

Across the state, three key east-west interstates run separate paths, connecting different places and towns. Starting where the Santa Monica Pier meets the shore, Interstate 10 stretches 243 miles toward Arizona, passing through Los Angeles and crossing into the desert beyond. For everyday life, it handles heavy traffic - people driving to work from the Westside, heading into downtown LA, or traveling farther south into Riverside County. Freight moves just as fast, shipping goods from coastal ports outward across the country. From the San Francisco Bay Bridge, Interstate 80 stretches 199 miles east across the Sierra Nevada, carrying traffic toward Lake Tahoe and the Nevada border. For people leaving the Bay Area, this route leads straight to Reno, Truckee, and winter slopes. Farther south, I-40 within California measures just 154 miles - the narrowest stretch across the state's roads. It begins in Barstow, cuts through the Mojave Desert, ends near Needles, links remote towns, serves drivers bound for Arizona, continues into the desert’s heart.

The Southern California Web: I-15, I-405, and Auxiliary Routes

Out in Southern California, roads stack close together. Running west from San Diego, Interstate 15 stretches 295 miles across Riverside and San Bernardino counties, heading into Nevada - its primary function links the region to Las Vegas while handling heavy traffic for workers living outside city limits. Nearby, the I-405 - known as the San Diego Freeway - follows a similar path as I-5 across the heart of Los Angeles, earning reputation as one of the planet’s most crowded routes, moving between 400 and 600 thousand vehicles daily during busy seasons. What stands out next are roads like I-710 - also known as the Long Beach Freeway - and the I-605, which follows the San Gabriel River Freeway. Then there's I-215, built alongside I-15 for different paths. Routes such as I-805 show up too, along with another one labeled I-580 found in the Bay Area. All these lines shape how folks and freight travel through an incredibly crowded urban zone near the planet’s densest collection of settlements.

Modern Innovations and Ongoing Challenges

These days, Caltrans along with local groups are pouring money into upgrading how things work. On stretches like I-10, I-405, I-110, I-15, and I-580, ExpressLanes run under high-occupancy toll setups - offering motorists an alternative: regular roads or quicker paid routes. You see signs that change messages nonstop now; traffic signals on ramps adjust flow minute by minute too. People check live traffic info right from their phones without thinking twice. Still, problems linger. Old systems are falling apart, while earthquakes demand stronger buildings - think back to what happened in 1994 near Los Angeles. For years, driving has ruined nature, yet cleaner air and quieter streets now matter more than ever. Where homes were torn down long ago, people still feel pushed out by traffic-heavy zones today.

Californians see highways not only as pathways but as common ground where routines cross. Parents walk children to classrooms while delivery vans navigate streets under summer heat. Trucks hauling farm goods move across routes linking distant fields to city markets worth nearly sixty billion dollars annually. On weekends, cars fill roads leading to beaches, mountains, or desert stretches where drivers hum along without speaking. Stuck behind wheels on the 405, someone might tune into a show instead of silence. Traveling through the Grapevine, sound from the car's speaker fills moments evenly. Near dawn on I-40, light spreads - not just across asphalt but across towns spread wide across land.

Out here, highways keep shifting - with plans to expand lanes, power stations for big rigs on electric routes, better links for city buses, also stronger shakes resistance when earth moves. Right at this moment, plus years ahead, those road stretches still hold together lives, hopes, movements across one out of every three U.S. residents.