Mountain Mesa, CA has a population of 886 and is the 15,905th largest city in the United States. The population density is 1,022 per sq mi which is 340% higher than the California average and 1028% higher than the national average. The median age in Mountain Mesa is 53 which is approximately 46% higher than the California average of 36. In Mountain Mesa, 40% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 87% of Mountain Mesa residents were born in California, 13% were born out of state, 0% were born outside of the United States and 0% were foreign born.