Belvedere, CA has a population of 2,017 and is the 10,978th largest city in the United States. The population density is 3,884 per sq mi which is 1571% higher than the California average and 4186% higher than the national average. The median age in Belvedere is 57 which is approximately 58% higher than the California average of 36. In Belvedere, 82% of the population over 15 years of age are married, 85% speak English and 5% speak Spanish. 40% of Belvedere residents were born in California, 43% were born out of state, 3% were born outside of the United States and 14% were foreign born.