Northern Branch
1050 Mission Rd., South San Francisco
131 - Exit Grand Ave./Willow Ave. (back entrance)

Central Branch
800 North Humboldt St., San Mateo
Located between Peninsula Ave. and East Poplar Ave. on North Humboldt St. (one block east of Delaware St.).
Northbound: 292 - Exit Delaware St./ Peninsula Ave.
Southbound: 292 - Exit Delaware St./East Poplar Ave.

Southern Branch
400 County Center (formerly 401 Marshall St.), Redwood City
ECR, 270, 274, 275, 276, 278 (Saturdays only), 295, 296, 398 - Exit at Redwood City Caltrain Station. Cross railroad tracks at Broadway at the north end of the station. Walk east on Marshall St. to Warren St. Turn left on Warren St. and then right on Bradford St.

Juvenile Branch (Hillcrest Juvenile Hall)
222 Paul Scannel Dr., San Mateo
260 - Limited service (Monday - Friday only)