Explore Hillsborough local geography, civic resources and voter guides, with dated official population and registration facts for San Mateo County.
At a glance: Hillsborough is an incorporated city in San Mateo County. Population: 11,249 (California Department of Finance estimate as of January 1, 2026). Registered voters: 8,403 (California Secretary of State, as of September 4, 2026).
Hillsborough spreads across wooded hills west of Burlingame and San Mateo. Its predominantly residential landscape has no conventional commercial downtown, making neighboring cities important destinations for shopping and other daily errands. Town Hall on Floribunda Avenue is the center for municipal business. Vista Park supplies public outdoor space, while the Carolands estate is a prominent architectural landmark rather than a general-purpose municipal recreation facility. Hillsborough incorporated on May 5, 1910. It is a general-law town with a council-manager government, providing municipal services that include police, public works and water. The date is recorded in the county's Hillsborough profile.
Town Hall is at 1600 Floribunda Avenue. Confirm department-specific hours before visiting.
No. It is a historic estate with separately managed access, not a drop-in municipal recreation center.
San Mateo County elections manages voter registration and voting information for Hillsborough residents.
8,403 (California Secretary of State, as of September 4, 2026).
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