South Gate, CA has a population of 95,219 and is the 329th largest city in the United States. The population density is 13,159 per sq mi which is 5562% higher than the California average and 14424% higher than the national average. The median age in South Gate is 31 which is approximately 13% lower than the California average of 36. In South Gate, 46% of the population over 15 years of age are married, 11% speak English and 89% speak Spanish. 53% of South Gate residents were born in California, 3% were born out of state, 1% were born outside of the United States and 43% were foreign born.