South San Jose Hills, CA has a population of 19,914 and is the 2,185th largest city in the United States. The population density is 13,206 per sq mi which is 5583% higher than the California average and 14476% higher than the national average. The median age in South San Jose Hills is 31 which is approximately 13% lower than the California average of 36. In South San Jose Hills, 49% of the population over 15 years of age are married, 16% speak English and 75% speak Spanish. 54% of South San Jose Hills residents were born in California, 3% were born out of state, 1% were born outside of the United States and 43% were foreign born.