U.S. Route 101 in California

In the U.S. state of California, U.S. Route 101 (US 101) is one of the last remaining and longest U.S. Routes still active in the state, and the longest highway of any kind in California.^[2] US 101 was also one of the original U.S. Routes established in 1926.

U.S. Route 101
Route information
Maintained by Caltrans
Length	808.111 mi[1] (1,300.529 km) Parts of US 101 have been given to or are otherwise taken care of by local or other governments, and are not a part of the length.
Existed	1926–present
Major junctions
South end	I-5 / SR 60 / I-10 in Los Angeles
Major intersections	I-405 in Los Angeles I-280 / I-680 in San Jose I-880 in San Jose I-380 in South San Francisco I-80 in San Francisco I-580 in San Rafael SR 299 in Arcata US 199 near Crescent City
North end	US 101 at Oregon state line
Location
Country	United States
State	California
Highway system
United States Numbered Highway System List Special Divided State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← SR 99 SR 103 →

This route is part of the California Freeway and Expressway System.^[3]

US 101 starts at Olympia, Washington, runs south through the rest of Washington, through Oregon and then through California to Los Angeles.

The Golden Gate Bridge in San Francisco is part of US 101.

Southern Californians usually refer to the highway as The 101 (where it is mostly a freeway). In Northern California, people simply call it 101.