San Diego Country Estates, CA has a population of 10,547 and is the 3,786th largest city in the United States. The population density is 628 per sq mi which is 170% higher than the California average and 594% higher than the national average. The median age in San Diego Country Estates is 43 which is approximately 20% higher than the California average of 36. In San Diego Country Estates, 68% of the population over 15 years of age are married, 94% speak English and 3% speak Spanish. 59% of San Diego Country Estates residents were born in California, 35% were born out of state, 1% were born outside of the United States and 5% were foreign born.