Region guide

Discovering the Peninsula — Start Here

The Peninsula is the strip of land between San Francisco and San Jose, with San Francisco Bay on one side and the Santa Cruz Mountains and Pacific Ocean on the other. Almost everything about how these cities feel comes back to that geography.

At a glance

  • Where it is: San Mateo County plus the northern edge of Santa Clara County, roughly from South San Francisco down through Palo Alto.
  • The shape: long and narrow. Most cities run east to west, from the bay shoreline up toward the hills.
  • The anchors: San Francisco at the north end, Silicon Valley employment centers at the south end.
  • What makes it different: a single rail line and a single historic road (El Camino Real) connect nearly every city, which shapes how people live and commute here.

Housing character

  • Bayside communities tend to be flatter, with more post-war tract housing and pockets of newer condo and townhome development.
  • Inland and hillside communities generally have larger lots, more varied terrain, and more custom or older homes.
  • Coastal communities are smaller and separated by the hills, with a marine climate that changes daily life noticeably.

Around town

  • Downtowns are typically small and walkable, clustered around a Caltrain station rather than a freeway exit.
  • The Santa Cruz Mountains and the bay shoreline both offer extensive trail systems.
  • Microclimates are real here — a coastal city can be 15 degrees cooler and much foggier than a bayside city 10 miles away.

Getting around

  • Caltrain runs the length of the Peninsula with stations in most cities. This is why "walkable to Caltrain" appears so often in listings.
  • Highway 101 carries most bayside commute traffic; Interstate 280 runs parallel along the western hills.
  • BART reaches the northern Peninsula at Millbrae and San Bruno, and connects to San Francisco International Airport.
  • State Route 92 and State Route 84 cross the hills to the coast and connect to the San Mateo–Hayward and Dumbarton bridges.

What to check

  • Bridge and highway crossings concentrate traffic at a few points, so commute experience varies sharply by which side of a city you live on.
  • Coastal cities are reached by mountain roads that can close or slow in storms.
  • A great deal of the housing stock predates 1970, which affects renovation, permitting, and inspection expectations.
  • Verify current transportation service, school assignment, permit requirements, hazard information, and total housing costs for the specific address.

Cities in the Peninsula

South San FranciscoNorthern Peninsula city with BART and Caltrain, a large life-sciences employment base, and bayfront redevelopment.San BrunoBART and Caltrain access next to SFO, with established mid-century neighborhoods and ongoing downtown redevelopment.MillbraeSmall northern Peninsula city where BART and Caltrain meet in a single station, with a walkable Broadway district.BurlingameTree-lined mid-Peninsula city with two Caltrain stations, a walkable Burlingame Avenue downtown, and older housing stock.HillsboroughEntirely residential town of large lots and estate homes, with no commercial zoning at all.San MateoMid-Peninsula city with Caltrain stations, a downtown district, and a mix of condos, houses, and hillside neighborhoods.Foster CityPlanned bayside community built around a lagoon system, with HOA developments and direct San Mateo Bridge access.BelmontHillside mid-Peninsula city between San Mateo and San Carlos, with a Caltrain station and extensive trail access.San CarlosCompact mid-Peninsula city with a walkable Laurel Street downtown, Caltrain access, and hillside neighborhoods.Redwood CityCentral Peninsula city with an active downtown, a wide mix of housing, and bayside Redwood Shores.Menlo ParkSouthern Peninsula city with a Santa Cruz Avenue downtown, distinct districts, and Dumbarton Bridge access.East Palo AltoBayside southern Peninsula city with newer development, shoreline access, and direct Dumbarton Bridge connections.Palo AltoStanford-adjacent city with two downtowns, two Caltrain stations, Eichler neighborhoods, and heavy tree cover.AthertonEntirely residential town of one-acre lots and heavy tree cover, with no commercial district.WoodsideRural-residential town in the western hills with acreage, equestrian properties, and extensive trail networks.Half Moon BayCoastal city on the Pacific side of the hills, with beaches, a small Main Street, and a different climate.PacificaCoastal city just south of San Francisco, made up of several distinct beach and valley neighborhoods.