Lake Riverside, CA has a population of 1,069 and is the 14,733rd largest city in the United States. The population density is 147 per sq mi which is 37% lower than the California average and 62% higher than the national average. The median age in Lake Riverside is 40 which is approximately 12% higher than the California average of 36. In Lake Riverside, 58% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 57% of Lake Riverside residents were born in California, 41% were born out of state, 0% were born outside of the United States and 2% were foreign born.