Mount Hermon, CA has a population of 993 and is the 15,209th largest city in the United States. The population density is 1,528 per sq mi which is 557% higher than the California average and 1586% higher than the national average. The median age in Mount Hermon is 42 which is approximately 16% higher than the California average of 36. In Mount Hermon, 73% of the population over 15 years of age are married, 79% speak English and 19% speak Spanish. 64% of Mount Hermon residents were born in California, 20% were born out of state, 0% were born outside of the United States and 15% were foreign born.