21 routes assigned to the "E" zone of the California Route Marker Program, which designates county routes in California. The "E" zone includes county highways...

34 routes assigned to the "S" zone of the California Route Marker Program, which designates county routes in California. The "S" zone includes county highways...

County routes in the U.S. state of California are controlled and maintained by the respective counties in which they are located. However, they are generally...

California. At 656 miles (1,056 km), it is the longest state route in California, and the second-longest in the US after Montana Highway 200. SR 1 has several portions...

both Route 7 and Route 710. The California Streets and Highways Code defines Route 710 as follows: 622. Route 710 is from Route 1 to Route 210 in Pasadena...

Southern California, United States. As of the 2020 census, the population was 3,186,989, making it the third-most-populous county in California, the sixth-most-populous...

98°W / 33.73; -115.98 Riverside County is a county located in the southern portion of the U.S. state of California. As of the 2020 census, the population...

Contra Costa County (/ˌkɒntrə ˈkɒstə/ ; Contra Costa, Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay...

Ventura County (/vɛnˈtʊərə/ ) is a county located in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843...

Alameda County (/ˌæləˈmiːdə/ AL-ə-MEE-də) is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making...