Marin County ( /məˈrɪn/) is a county located in the North San Francisco Bay Area of the U.S. state of California, across the Golden Gate Bridge from San Francisco. As of 2010, the population was 252,409. The county seat is San Rafael and the largest employer is the county government. Marin County is well known for its natural beauty, liberal politics and affluence. In May 2009, the county had the fifth highest income per capita in the United States at $91,483. The county is governed by local cities and the Marin County Board of Supervisors.