Riverside, CA has a population of 318,678 and is the 59th largest city in the United States. The population density is 3,922 per sq mi which is 1588% higher than the California average and 4229% higher than the national average. The median age in Riverside is 31 which is approximately 13% lower than the California average of 36. In Riverside, 48% of the population over 15 years of age are married, 58% speak English and 34% speak Spanish. 62% of Riverside residents were born in California, 14% were born out of state, 1% were born outside of the United States and 22% were foreign born.