U.S. Route 399

U.S. Route 399 marker
U.S. Route 399
Map
US 399 highlighted in red
Route information
Auxiliary route of US 99
Maintained by Caltrans
Length124 mi[1] (200 km)
Existed1934–1964
Major junctions
South end US 101 in Ventura
North end US 99 in Bakersfield
Location
CountryUnited States
StateCalifornia
CountiesVentura, Santa Barbara, San Luis Obispo, Kern
Highway system
US 395 I-405

U.S. Route 399 was a U.S. Highway in the state of California that ran from Ventura to Bakersfield. It was established in 1934 and decommissioned in 1964, as it was only 124 miles (200 km) long, less than the 300-mile (480 km) minimum that the American Association of State Highway and Transportation Officials (AASHTO) set as the threshold for U.S. Highways. It has been replaced with a segment of State Route 33 (SR 33), all of SR 119, and a segment of SR 99.

  1. ^ Cite error: The named reference RMN1947 was invoked but never defined (see the help page).