This is a list of U.S. Routes in the U.S. state of California. It includes routes defined by the California State Legislature but never built, as well as routes entirely relinquished to local governments. It also includes the routes that were decommissioned during the 1964 state highway renumbering.

Each U.S. Route in California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route^[2][3]) number in the Streets and Highways Code (Sections 300-635). Under the code, the state assigns a unique Route X to each highway and does not differentiate between state, US, or Interstate highways.

California still uses a version of the 1961 U.S. Route shield, featuring a simplified cutout shield containing only the outer border, "U S," and the route marker. All other U.S. states adopted the 1971 version of the marker, consisting of a white shield outline on a black square background.

• Lengths for each state route were initially measured as they were during the 1964 state highway renumbering (or during the year the route was established, if after 1964) based alignment that existed at the time, and do not necessarily reflect the current mileage. Portions of some routes have been relinquished to or are otherwise maintained by local or other governments, and may not be included in the length listed below. Several routes are broken into non-contiguous pieces, and their lengths may not reflect the overlaps that would be required to make them continuous. Some routes may also have a gap because it is either explicitly defined in the California Streets and Highways Code or due to an unconstructed portion, and the listed length may or may not reflect the gap.
• If a route was renumbered, the old or new number is given in the "notes" column.
• Concurrences are not explicitly codified in the Streets and Highways Code; such highway segments are listed on only one of the corresponding legislative route numbers. When a highway is broken into such segments, the total length recorded by Caltrans only reflects those non-contiguous segments, and does not include those overlaps that would be required to make the route continuous.
• Since the 1990s, a number of piecemeal relinquishments have been made. These are generally reflected in the length but not the termini.
• Former termini are not shown if they are along the current route, meaning that the route was simply extended.
• A U.S. Route may be partially signed as an Interstate Highway, while the remaining segment is signed as a U.S. Route.

More information Number, Length (mi) ...

Number	Length (mi)[4][lower-alpha 1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
US 6	40.505	65.186	US 395 in Bishop	Nevada state line	01937-01-011937	current	Until 1964 western terminus was in Long Beach
US 40	—	—	US 101 in San Francisco	Nevada state line	01926-01-011926	01964-01-011964	Replaced by I-80
US 48	87.3[lower-alpha 2][lower-alpha 3]	140.5	First Street in San Jose	French Camp Road in French Camp	01926-01-011926	01931-01-011931	Renumbered as US 50
US 50	108.624	174.813	I-80 in West Sacramento	Nevada state line	01926-01-011926	current	Until 1964 western terminus was in San Francisco
US 60	255[lower-alpha 2][lower-alpha 3]	410	I-5 and former US 99 in Los Angeles	Arizona state line	01926-01-011926	01972-01-011972	Replaced by I-10; ran concurrently with US 70
US 66	315[lower-alpha 2][lower-alpha 3]	507	SR 1 and former US 101 Alt. in Santa Monica	Arizona state line	01926-01-011926	01969-01-011969	Replaced by I-40 and other routes
US 70	255[lower-alpha 2][lower-alpha 3]	410	I-5 and former US 99 in Los Angeles	Arizona state line	01926-01-011926	01964-01-011964	Replaced by I-10; ran concurrently with US 60
US 80	176.53[lower-alpha 2][lower-alpha 3]	284.10	I-5 and former US 101 in San Diego	Arizona state line	01926-01-011926	01964-01-011964	Replaced by I-8
US 91	—	—	SR 1 and former US 101 Alt. in Long Beach	Nevada state line	01926-01-011926	01971-01-011971	Replaced by I-15 and SR 91
US 95	116.721[lower-alpha 4]	187.844	Arizona state line	Nevada state line	01930-01-011930	current
US 97	54.364	87.490	I-5 in Weed	Oregon state line	01935-01-011935	current
US 99	754[lower-alpha 2][lower-alpha 3]	1,213	Fed. 5 near Calexico	Oregon state line	01926-01-011926	01964-01-011964	Replaced by I-5; completely decommissioned in 1972
US 99E	141[lower-alpha 2][lower-alpha 3]	227	SR 99 and former US 99 in Wheeler Ridge	SR 99 and former US 99 in Sacramento	01929-01-011929	01933-01-011933	Most of former US 99E is now part of SR 99
US 99W	—	—	SR 99 and former US 99 in Wheeler Ridge	SR 99 and former US 99 in Sacramento	01929-01-011929	01964-01-011964	Replaced by majority of I-5
US 101	808.111[lower-alpha 2]	1,300.529	I-5 / I-10 / SR 60 in Los Angeles	Oregon state line	01926-01-011926	current	Segment across the Golden Gate Bridge is not officially recognized as part of the state highway system; until 1964 southern terminus was in San Diego
US 101W	—	—	I-880 and US 101	I-580 and US 101	01929-01-011929	01940-01-011940	Reverted to US 101 after US 101E was decommissioned
US 101E	—	—	US 101	US 101	01929-01-011929	01940-01-011940	Renumbered into SR 17
US 199	36.41	58.60	US 101 near Crescent City	Oregon state line	01926-01-011926	current
US 299	304[lower-alpha 2][lower-alpha 3]	489	US 101 in Arcata	US 395 in Alturas	01934-01-011934	01964-01-011964	Replaced by the majority of SR 299
US 395	556.909[lower-alpha 2][lower-alpha 3]	896.258	I-15 near Hesperia	Oregon state line	01979-01-011979	current	Split into two segments, as the highway clips into Nevada to serve Carson City and Reno; until 1969 southern terminus was in San Diego
US 399	137[lower-alpha 2][lower-alpha 3]	220	US 101 in Ventura	SR 99 and former US 99 in Bakersfield	01934-01-011934	01964-01-011964	Replaced by SR 33 and SR 119
US 466	526[lower-alpha 2][lower-alpha 3]	847	SR 1 in Morro Bay	Nevada state line	01935-01-011935	01965-01-011965	Replaced by SR 58 and I-15; ran concurrently with former US 91
Former

Close

• 
  Road sign on US 6 showing that it is 3205 miles to its eastern end in Provincetown, Massachusetts
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  US 50 westbound as it winds down Echo Summit towards the west
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  US 95 southbound at the California-Nevada state line
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  US 97 sign on I-5 in the City of Weed
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  US 101 northbound approaching Gaviota Tunnel through the Santa Ynez Mountains
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  US 199 southbound at the California-Oregon state line
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  US 395 southbound descending into Owens Valley from the Sierra Nevada, just north of Bishop

•  California Roads portal