A display of all the land within the County which receive tax breaks under the Williamson Act.

A map of all the open space within San Mateo County

Beaches, open spaces, and parks administered by San Mateo County.

Trails in San Mateo County that are administered by other entities. Includes the California Coastal Trail, Fifield-Cahill Range Trail, Juan Batista De Anza Trail, and the San Francisco Bay Trail .

Parking lots at trailheads within the Midpeninsula Regional Open Space District.

Trails that are open to the public within the Midpeninsula Regional Open Space District.

Ward boundaries for the Midpeninsula Regional Open Space District (MROSD). MROSD is divided into seven geographic wards, each represented by an elected Board member for a four-year term.

Boundaries of the Midpeninsula Regional Open Space District preserve. This data includes areas that are not open to the public.

Hiking, biking, and equestrian trails managed by San Mateo County.