The City and County of San Francisco is the fourth most populous city in California and the fourteenth-most populous in the United States, with a 2006 estimated population of 744,041. San Francisco is the second most densely populated major city in the U.S. San Francisco is located on the tip of the San Francisco Peninsula, with the Pacific Ocean to the west, the San Francisco Bay to the east, and the Golden Gate to the north. San Francisco apartments for rent comparison page shows most up to date rent information on San Francisco apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.