El Rio, CA has a population of 7,412 and is the 4,969th largest city in the United States. The population density is 3,662 per sq mi which is 1476% higher than the California average and 3942% higher than the national average. The median age in El Rio is 31 which is approximately 13% lower than the California average of 36. In El Rio, 46% of the population over 15 years of age are married, 26% speak English and 70% speak Spanish. 56% of El Rio residents were born in California, 6% were born out of state, 1% were born outside of the United States and 38% were foreign born.