Millbrae is a city in San Mateo County, California, United States, just west of San Francisco Bay, with San Bruno on the north and Burlingame on the south. The population was 21,536 at the 2010 census.
Darius Ogden Mills purchased land in the 1860s from the Sanchez family to build a country estate. The former Mills estate was bordered by what is now Skyline Boulevard, Bayshore Highway U.S. Route 101, Millbrae Avenue and Trousdale Drive. The estate became known as "Millbrae" from "Mills" and the Scottish word "brae," which means "rolling hills" or "hill slope." Children swam in three lakes situated on the estate and sold acacias to tourists before the Mills family began to sell the land for development. The estate's spectacular mansion burned down during a realistic "fire drill" in 1954.
Millbrae used a private patrol financed by fees from merchants and residents until 1941, when the San Mateo County Board of Supervisors created the Millbrae Police District. Records of the Internal Revenue Service document the licensing of several Millbrae bars for gambling; only after incorporation were gambling laws enforced in Millbrae and not until the 1950s was gambling defeated. In 1931, citizens organized a volunteer fire department, which remained entirely volunteer until 1938. The police and fire departments were housed together for several years at Hillcrest Boulevard and El Camino Real before the vital services moved to their permanent location in Millbrae's civic center, a few blocks west of El Camino.
The Millbrae Intermodal Terminal is an at-grade Bay Area Rapid Transit (BART) and Caltrain station located in suburban Millbrae, California, in northern San Mateo County. It was expected to support over 30,000 BART trips per day, but has consistently fallen well short of projections.
Millbrae Station is the largest intermodal terminal in the United States west of the Mississippi (the under-construction Transbay Transit Center in San Francisco will be larger when completed). It has three ground-level tracks for BART and two for Caltrain. An island platform allows a cross-platform connection between the two systems (for traveling to San Francisco or the San Francisco International Airport). A concourse mezzanine is above the platforms. Currently two BART tracks and one island platform usually are kept out of regular service, used instead to hold train sets that are also out of service.
The station is also a regional bus transit hub with multiple bus bays served by several SamTrans lines.