Spring Valley, CA has a population of 30,128 and is the 1,418th largest city in the United States. The population density is 4,106 per sq mi which is 1504% higher than the California average and 4432% higher than the national average. The median age in Spring Valley is 35 which is approximately 4% lower than the California average of 36. In Spring Valley, 52% of the population over 15 years of age are married, 64% speak English and 26% speak Spanish. 59% of Spring Valley residents were born in California, 21% were born out of state, 3% were born outside of the United States and 18% were foreign born.