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Twin Peaks, California. For the hills in San Francisco, California, see Twin Peaks (San Francisco). Twin Peaks is an unincorporated community in San Bernardino County, California, United States, located on California State Route 189 2.5 miles (4.0 km) west-southwest of Lake Arrowhead. Twin Peaks has a post office with ZIP code 92391, which opened in 1916.
Enjoy your visit today, and return often to experience the many features of Joseph D. Grant County Park. How to Get There. Joseph D. Grant County Park is located at 18405 Mt. Hamilton Rd., San Jose, CA 95140, in the east of Santa Clara Valley. Travel to the park by taking Highway 101 or Highway 680 to Alum Rock Avenue eastbound in San Jose.