what county is twin peaks california in
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.