Portola Valley, CA

ZIP code 94028 serves Portola Valley and nearby unincorporated communities in San Mateo County, on the western side of the San Francisco Peninsula. The area is predominantly residential, with low-density neighborhoods among foothills and open space. Notable landmarks include Windy Hill Open Space Preserve, the historic Alpine Inn, and Portola Valley Town Center, which contains civic and community facilities. Alpine Road links the area with neighboring towns and regional routes.