Colma is a small incorporated town in San Mateo County, California, United States, on the San Francisco Peninsula in the San Francisco Bay Area. The population was 1,507 at the 2020 census. The town was founded as a necropolis in 1924. With most of Colma's land dedicated to cemeteries, the population of the dead—not specifically known but speculated to be around 1.5 million—outnumbers that of the living by a ratio of nearly a thousand to one.