County in CaliforniaMarin County is in Northern California, across the Golden Gate Strait from San Francisco. The sprawling Marin Headlands has Golden Gate Bridge views, trails and the 1855 Point Bonita Lighthouse. North are the giant redwood trees of Muir Woods National Monument. Mount Tamalpais State Park’s namesake peak has panoramic views. The Frank Lloyd Wright–designed Marin County Civic Center is in county seat San Rafael.