State Route 1 (SR 1) is a major north -- south state highway that runs along most of the Pacific coastline of the U.S. state of California. At a total of just over 655.8 miles (1,055.4 km), it is the longest state route in California. SR 1 has several portions designated as either Pacific Coast Highway (PCH), Cabrillo Highway, Shoreline Highway, or Coast Highway. Its southern terminus is at Interstate 5 (I - 5) near Dana Point in Orange County and its northern terminus is at U.S. Route 101 (US 101) near Leggett in Mendocino County. SR 1 also at times runs concurrently with US 101, most notably through a 54 - mile (87 km) stretch in Ventura and Santa Barbara counties, and across the Golden Gate Bridge.
where does highway 1 start in southern california
at Interstate 5 (I - 5) near Dana Point in Orange County