Based upon 2009 US Census estimates, below are figures of the Latino population in the following Southern California counties. Los Angeles – 4,727,045 Orange County- 1,035,162 San Bernardino – 970,501 San Diego – 955,837 Riverside – 950,072 According the estimates the total Southern California population is 21,281,746 of which 9,112,216 are Latino. Source: quickfacts.census.gov