Waterford, CA has a population of 8,708 and is the 4,375th largest city in the United States. The population density is 3,692 per sq mi which is 1489% higher than the California average and 3976% higher than the national average. The median age in Waterford is 31 which is approximately 13% lower than the California average of 36. In Waterford, 58% of the population over 15 years of age are married, 61% speak English and 37% speak Spanish. 70% of Waterford residents were born in California, 8% were born out of state, 1% were born outside of the United States and 21% were foreign born.