Valley Center, CA has a population of 9,783 and is the 4,003rd largest city in the United States. The population density is 356 per sq mi which is 53% higher than the California average and 293% higher than the national average. The median age in Valley Center is 40 which is approximately 11% higher than the California average of 36. In Valley Center, 64% of the population over 15 years of age are married, 78% speak English and 19% speak Spanish. 63% of Valley Center residents were born in California, 23% were born out of state, 1% were born outside of the United States and 13% were foreign born.