City Guide
Hillsborough
Peninsula Estate Living
A town of grand residences and winding roads where twentieth-century fortunes built a guarded civic landscape
Hillsborough occupies rolling terrain between Burlingame, San Mateo, and Interstate 280 in central San Mateo County — a town of large estates, minimum half-acre lots, and no commercial district. Incorporated in 1910, Hillsborough attracted wealthy San Franciscans who built country homes along creeks and ridgelines, establishing a residential municipality that has preserved its low-density character for more than a century.
Indigenous / Early History
Ramaytush Ohlone people used the wooded hills and creek corridors of the mid-Peninsula for hunting, acorn gathering, and seasonal camps. Springs and riparian zones in the area that became Hillsborough provided freshwater resources that later attracted estate developers. Spanish and Mexican rancho grants encompassed the hills within larger holdings; American-era subdivision eventually carved residential parcels from former rancho land.
Founding & Early Development
Wealthy San Franciscans purchase hill country parcels for summer estates and year-round residences.
Hillsborough incorporates as a town, adopting zoning that preserves large lots and prohibits commercial development.
The town hall opens, anchoring civic functions in a purely residential municipality.
Early estate owners commissioned architects to design mansions in styles ranging from Tudor Revival to Mediterranean. Names including Crocker, Tobin, and Spreckels appear in the town's architectural history, linking Hillsborough to San Francisco's Gilded Age fortunes.
Twentieth-Century Growth
Hillsborough grew slowly and selectively. Unlike neighboring Burlingame and San Mateo, the town did not welcome tract development or apartment construction. World War II and postwar Peninsula expansion increased land values without fundamentally altering the town's one-house-per-lot minimums and absence of commercial zones.
Crystal Springs Reservoir construction affects watershed access; estate owners adapt to changing water and road infrastructure.
Silicon Valley growth increases demand for executive housing on the mid-Peninsula without triggering density increases in Hillsborough.
Town policies reinforce minimum lot sizes and strict design review for new construction and renovations.
Economy & Employment
Hillsborough has no commercial tax base. Residents work throughout the Bay Area — in technology, finance, law, medicine, and corporate leadership — commuting from a residential address that offers privacy and space. Nearby Burlingame and San Mateo provide retail and dining; Hillsborough itself functions exclusively as a place of residence within the regional economy.
Market & Housing Context
Census tract-level data from the American Community Survey supplements decennial counts for understanding neighborhood-level tenure and structure types.
Public records from city planning departments and county assessor data provide context for land use and housing trends without constituting financial guidance.
The 2020 U.S. Census recorded 11,387 residents and 3,935 total housing units in Hillsborough. Census data indicate approximately 93 percent owner-occupied households — among the highest owner-tenure rates in San Mateo County. Housing consists almost entirely of detached single-family homes on large lots, many dating to the early twentieth century with subsequent renovations and rebuilds. Vacancy data include estate properties and seasonal residences not occupied year-round.
Living in Hillsborough
Because Hillsborough lacks commercial zones, residents depend on Burlingame, San Mateo, and Millbrae for groceries, dining, and professional services. The trade-off — privacy and estate living versus walkable amenities — defines the town's relationship with its neighbors.
Hillsborough has no downtown. Civic life centers on town hall, the police department, and community events at the town center. Crystal Springs Reservoir and the Crystal Springs Golf Club border the town, offering recreation and open views. Public schools are operated by the Hillsborough City School District and San Mateo Union High School District — named institutions serving the community. Burlingame Avenue and downtown San Mateo supply commercial amenities within a short drive.
Hillsborough Today
11,387
Population (2020 Census)
6.2 sq mi
Incorporated Land Area
3,935
Total Housing Units (2020 Census)
1910
Year of Incorporation
Government and Civic Life
Hillsborough operates under a town council form of government. Land-use decisions receive meticulous review, including architectural design standards, tree protection, and lot-coverage limits. The town contracts for fire protection and shares emergency services with neighboring agencies. Fiscal policy relies on property taxes from high-value residential parcels.
Historic Estates
Filmmakers and historians occasionally document Hillsborough's estate architecture, which includes contributions from architects who shaped Bay Area residential design in the early twentieth century. The town's strict tree ordinances and underground utility policies reflect long-standing aesthetic standards applied to both historic and contemporary construction.
Geography & Environment
Hillsborough's terrain rolls between creek valleys and low ridgelines, with mature oaks and landscaped estate grounds defining the visual character. Crystal Springs Reservoir forms a dramatic western boundary. The Mediterranean climate supports gardens and tree canopy that contribute to the town's secluded atmosphere.
Regional agencies including the Metropolitan Transportation Commission, SamTrans, and Caltrain coordinate service improvements that affect daily commuting patterns for residents employed throughout the Bay Area. City officials participate in these forums to represent local priorities on transit funding, highway maintenance, and Peninsula growth management.
Transportation & Connectivity
Interstate 280 passes through Hillsborough, providing freeway access to San Francisco and San Jose. Burlingame and Hillsdale Caltrain stations lie in adjacent cities. Within Hillsborough, winding residential roads discourage through traffic; residents typically drive to retail, transit, and employment centers in neighboring communities.
Crystal Springs Road and Skyline Boulevard provide scenic driving routes through and adjacent to Hillsborough, connecting the town to Skyline Boulevard recreation areas in the Santa Cruz Mountains.
Hillsborough contracts with San Mateo County for certain services while maintaining independent police and planning departments focused exclusively on residential land use.
Looking Forward
Hillsborough addresses state housing mandates, accessory dwelling unit regulations, and wildfire preparedness in a heavily wooded residential environment. Town planning emphasizes preservation of estate character while evaluating limited opportunities for infill housing. Regional traffic on Interstate 280 and Crystal Springs Road affects commuting for residents employed throughout the Bay Area.
The town's police department and municipal court handle local matters, while residents vote in county, state, and federal elections as part of the broader San Mateo County electorate.
The City's Character
Hillsborough remains what its founders intended — a town of estates and discretion, where civic life is quiet, land values are high, and commercial bustle is someone else's geography.
"Hillsborough sold no lots to commerce — only views, space, and the promise that San Francisco's hill country would survive the Peninsula's suburban century."
Whether passing the gates of a Tudor mansion or climbing toward Crystal Springs, visitors encounter a community that has guarded its residential identity since incorporation — an enclave of permanence amid regional transformation.