Belvedere is an incorporated city located on the San Francisco Bay in Marin County, California, United States. Consisting of two islands and a lagoon, it is connected to the Tiburon Peninsula by two causeways. At the 2010 census, the population was 2,068. The per-capita (per person) income of Belvedere residents in the year 2000 was $250,000, making it one of the highest-income cities in California and the eighth highest-income community in the United States (highest with a population of over 1,000 residents). Belvedere and Tiburon share a post office and the 94920 zip code.