The City and County of San Francisco is the fourth-largest city in California and the 14th-largest in the United States, with a 2005 population of 799,263.As of the censusGR2 of 2000, there were 776,733 people, 329,700 households, and 145,068 families residing in the city. The population density was 6,423.2/km² (16,634.4/mi²), making it the second densest city of 500,000 or more, as well as the fifth densest county, in the country [7]. There were 346,527 housing units at an average density of 2,865.6/km² (7,421.2/mi²). The racial makeup of the city was 49.66% White, 7.79% African American, 0.45% Native American, 30.84% Asian, 0.49% Pacific Islander, 6.48% from other races, and 4.28% from two or more races.