Westhaven-Moonstone, CA has a population of 988 and is the 15,247th largest city in the United States. The population density is 122 per sq mi which is 47% lower than the California average and 35% higher than the national average. The median age in Westhaven-Moonstone is 48 which is approximately 33% higher than the California average of 36. In Westhaven-Moonstone, 56% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 59% of Westhaven-Moonstone residents were born in California, 37% were born out of state, 0% were born outside of the United States and 4% were foreign born.