Hillsborough is an incorporated town in San Mateo County, California, set on the San Francisco Peninsula roughly 17 miles south of downtown San Francisco. It is bordered by Burlingame to the north, San Mateo to the east, the unincorporated Highlands-Baywood Park to the south, and Interstate 280 to the west. The town occupies a rolling, wooded landscape that has remained deliberately low-density, a defining contrast with the denser cities that surround it. From its earliest development, Hillsborough was conceived as a place of large country estates. Its historic districts hold some of the Peninsula's most significant residential architecture, much of it built between the early 1900s and the 1970s, with grand historic mansions, English and Mediterranean revival styles, and later custom modern and executive homes. Landmark properties such as the Carolands Chateau and the Tobin Clark Estate anchor its architectural reputation, and the town maintains strict zoning and minimum lot sizes that preserve its estate character. The community is almost entirely residential, with a small local government and no downtown commercial core. It relies on neighboring Burlingame and San Mateo for retail, dining, and services, an arrangement that keeps the town itself quiet and unhurried. Residents are drawn to the combination of privacy, spacious grounds, and proximity to San Francisco, Silicon Valley, and San Francisco International Airport, all reachable within a short drive. Education is a central part of the town's identity. Hillsborough operates its own highly regarded K-8 elementary district with four schools, and high school students attend Burlingame, Aragon, or San Mateo high schools in the adjacent San Mateo Union High School District. This self-contained approach to early education, combined with access to established Peninsula high schools, reinforces the town's appeal to families. Hillsborough suits those who value quiet, architectural character, and generous space over urban density, while remaining within easy reach of the employment centers and amenities that define the Bay Area. Its low-density, wooded streets give it an almost rural calm despite its central Peninsula location.