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 2010 Census, the city's population was 11,926. Larkspur is located north of San Francisco near Mount Tamalpais. Larkspur's Police Department is shared with that of the neighboring Corte Madera. Adjacent to Larkspur's downtown is Madrone Canyon, which is a residential area and a redwood grove.
According to the United States Census Bureau, the city has a total area of 3.24 sq mi (8.4 km2). 3.03 sq mi (7.8 km2) of it is land and 0.22 sq mi (0.6 km2) of it (6.66%) is water.
Charles W. Wright laid out the town in 1887. The first post office opened in 1891. Larkspur incorporated in 1908.