San Mateo is located on the Peninsula in the San Francisco Bay Area of California.
By air, San Mateo is conveniently located near San Francisco International Airport (SFO). Oakland (OAK) and San Jose (SJC) are alternative airports, though not preferable. By rail, use CalTrain (there are 3 CalTrain stations in San Mateo named San Mateo , Hayward Park, and Hillsdale) or BART from Millbrae. By car, US-101 and I-280 run through the city. It is also connected to the East Bay via the San Mateo-Hayward Bay Bridge.