Larkspur is a city in Marin County, California, United States. Larkspur is located 3 miles (4.8 km) south of San Rafael, at an elevation of 43 feet (13 m). As of the 2020 census, the city's population was 13,064. Larkspur's Police Department is shared with that of the neighboring Corte Madera and town of San Anselmo as the Central Marin Police Authority. Intersecting Larkspur's downtown is Madrone Canyon, a residential area amidst a redwood grove.

Corte Madera is an incorporated town in Marin County, California. Corte Madera is located 3.25 miles (5.2 km) south of San Rafael, at an elevation of 39 feet. The population was 10,222 at the 2020 census. The town was named after the Spanish imperative command "chop wood", as the area was famous for producing redwood tree lumber which was used in the construction of the city of San Francisco.