Monument Hills, CA has a population of 1,864 and is the 11,440th largest city in the United States. The population density is 463 per sq mi which is 81% higher than the California average and 411% higher than the national average. The median age in Monument Hills is 45 which is approximately 25% higher than the California average of 36. In Monument Hills, 66% of the population over 15 years of age are married, 82% speak English and 13% speak Spanish. 68% of Monument Hills residents were born in California, 24% were born out of state, 1% were born outside of the United States and 7% were foreign born.