List of Interstate Highways in California

Interstate Highways in California
Standard Interstate signage in California
Highway names
Interstates:	Interstate XX (I-XX)
US Highways:	U.S. Route XX (US XX)
State:	State Route XX (SR XX)
System links
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic

This is a list of Interstates in the U.S. state of California that have existed since the 1964 renumbering. It includes routes that were defined by the California State Legislature but never built, as well as routes that have been entirely relinquished to local governments.

Each state highway in California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route) number in the . Under the code, the state assigns a unique Route X to each highway, and does not differentiate between state, US, or Interstate highways.

I-5 in the Central Valley

Heavy traffic in downtown San Bernardino along I-10 near the interchange with the Downtown San Bernardino Freeway (I-215)

Former mileage sign at start of Interstate 40 in Barstow, California, 1997

Entering California from Nevada along I-80

Westbound view along Interstate 105 through the Interstate 110 interchange

Construction on I-215 between Inland Center Drive and Orange Show Road in San Bernardino

I-280 running along near Stanford University

Cars driving on I-405 through the Sepulveda Pass

Southbound at I-680 near SR 4, with Mount Diablo on the left.

The Miramar Road overpass on I-805 northbound, with the Eastgate Mall bridge in the background