| Interstate Highways in California | |
|---|---|
.svg) .svg) .svg) Highway shields for I-5, I-580, and I-80 Bus. Loop | |
 Interstate Highways highlighted in red; related state routes in purple | |
| System information | |
| Maintained by Caltrans | |
| Length | 2,466.744 mi (3,969.840 km) |
| Highway names | |
| Interstates | Interstate XX (I-XX) |
| Business Loop | Interstate XX Business Loop (I-XX Bus.) |
| System links | |
This is a list of Interstate Highways in the U.S. state of California that have existed since the 1964 renumbering. It includes routes defined by the California State Legislature but never built, as well as routes 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[1][2]) 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 Streets and Highways Code – via Wikisource.
- ^ California Department of Transportation. "Other State Highway Routes". Sacramento: California Department of Transportation.