Explore Millbrae local geography, civic resources and voter guides, with dated official population and registration facts for San Mateo County.
At a glance: Millbrae is an incorporated city in San Mateo County. Population: 23,062 (California Department of Finance estimate as of January 1, 2026). Registered voters: 14,587 (California Secretary of State, as of September 4, 2026).
Millbrae occupies a narrow Peninsula setting between the hills and San Francisco International Airport. Its downtown Broadway corridor and the BART-Caltrain interchange make rail connections especially visible in the city's daily life. Central Park and the Millbrae Recreation Center provide community recreation near the civic core. Millbrae Library offers another public gathering place, while City Hall on Magnolia Avenue houses municipal administration. Millbrae incorporated on January 14, 1948. It is a general-law city under a council-manager government, with some services supplied through outside agencies and contracts. Its incorporation date is listed in the county's Millbrae profile.
Yes. Millbrae station is an interchange for both systems; consult the transit operators for current service and fare details.
Central Park and the Millbrae Recreation Center are key destinations near the city's civic area.
Use San Mateo County elections for official voting-location, ballot and registration information.
14,587 (California Secretary of State, as of September 4, 2026).
CA Slates began with shared voter guides in 2012 and expanded into its current publication family and connected program.