Mountain House, CA has a population of 14,009 and is the 2,987th largest city in the United States. The population density is 4,388 per sq mi which is 1788% higher than the California average and 4743% higher than the national average. The median age in Mountain House is 34 which is approximately 6% lower than the California average of 36. In Mountain House, 70% of the population over 15 years of age are married, 58% speak English and 6% speak Spanish. 57% of Mountain House residents were born in California, 8% were born out of state, 3% were born outside of the United States and 33% were foreign born.