what is the population of san diego ca
San Diego is estimated to have a population of 1,339,000, up from an estimated 1.322 million in 2012. San Diego has a population estimated at 1.339 million. At the last census in 2010, San Diego's population was 1.307 million. San Diego has a population density of 4,003 people per square mile in the city proper. The metropolitan population is much larger, however, and is estimated at 3.1 million people.