California State Route 66
| Part of Historic U.S. Route 66 | ||||
SR 66 highlighted in red, with relinquished portions in pink. | ||||
| Route information | ||||
| Maintained by Caltrans | ||||
| Length | 32.321 mi (52.016 km) | |||
| Existed | 1974–present | |||
| Major junctions | ||||
| West end | SR 210 in La Verne | |||
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| East end | I-215 in San Bernardino | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | Los Angeles, San Bernardino | |||
| Highway system | ||||
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State Route 66 (SR 66) is a state highway in the U.S. state of California that runs along a section of former U.S. Route 66 (US 66) in Los Angeles and San Bernardino counties. It goes from SR 210 in La Verne east to Interstate 215 (I-215) in San Bernardino, passing through Claremont, Upland, Rancho Cucamonga, Fontana and Rialto along Foothill Boulevard. In San Bernardino, it is the part of Fifth Street west of H Street (at the I-215 interchange).