California county routes in zone R
| California county routes in zone R | |
|---|---|
Example of a California county route shield  | |
All county highways in zone R lie within Riverside County  | |
| Highway names | |
| County | County Route X (CR X) or Route X | 
| System links | |
There are two routes assigned to the "R" zone of the California Route Marker Program, which designates county routes in California. The "R" zone currently only includes county highways in Riverside County. A third "R" route in the county existed until 1970.