Marin County is located in the North San Francisco Bay Area in California, across the Golden Gate Bridge from San Francisco.The county seat is San Rafael. Marin County is renowned for its natural beauty, liberal politics and affluence. Marin County has the highest per capita income in the country at $44,962. The county has a total area of 828 miČ, 63% of it is land and 37% of it is water. As of 2000, there were 247,289 people, 100,650 households, and 60,691 families residing in the county. The population density was 476/miČ. The median income for a household in the county was $71,306, the second highest income in California.