Orange County, California is a county in Southern California. Its county seat is Santa Ana. With a population of 3,056,865 (2005 estimate [1]), it is the second most populous county in the state of California and the fifth most populous in the United States. As of the census2 of 2000, there were 2,846,289 people, 935,287 households, and 667,794 families residing in the county, making Orange County the second most populous county in California. The population density was 1,392/km² (3,606/mi²). There were 969,484 housing units at an average density of 474/km² (1,228/mi²). The racial makeup of the county was 64.81% White, 1.67% African American, 13.59% Asian, 0.70% Native American, 0.31% Pacific Islander, 14.80% from other races, and 4.12% from two or more races. 30.76% are Hispanic or Latino of any race. According to the U.S. Census Bureau, the county has a total area of 2,455 km² (948 mi²), making it the smallest county in Southern California. Surface water accounts for 411 km² (159 mi²) of the area, 16.73% of the total; 2,045 km² (789 mi²) of it is land.