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 and town of San Anselmo.