Monte Sereno, CA has a population of 3,514 and is the 8,032nd largest city in the United States. The population density is 2,149 per sq mi which is 825% higher than the California average and 2272% higher than the national average. The median age in Monte Sereno is 52 which is approximately 44% higher than the California average of 36. In Monte Sereno, 77% of the population over 15 years of age are married, 82% speak English and 2% speak Spanish. 50% of Monte Sereno residents were born in California, 31% were born out of state, 2% were born outside of the United States and 18% were foreign born.