Casa de Oro-Mount Helix, CA has a population of 20,137 and is the 2,167th largest city in the United States. The population density is 2,940 per sq mi which is 1165% higher than the California average and 3145% higher than the national average. The median age in Casa de Oro-Mount Helix is 45 which is approximately 24% higher than the California average of 36. In Casa de Oro-Mount Helix, 61% of the population over 15 years of age are married, 79% speak English and 12% speak Spanish. 56% of Casa de Oro-Mount Helix residents were born in California, 30% were born out of state, 1% were born outside of the United States and 13% were foreign born.