Spring Valley Lake, CA has a population of 7,710 and is the 4,833rd largest city in the United States. The population density is 2,596 per sq mi which is 914% higher than the California average and 2765% higher than the national average. The median age in Spring Valley Lake is 40 which is approximately 11% higher than the California average of 36. In Spring Valley Lake, 54% of the population over 15 years of age are married, 87% speak English and 4% speak Spanish. 71% of Spring Valley Lake residents were born in California, 18% were born out of state, 1% were born outside of the United States and 11% were foreign born.