Montebello Bus Lines' (MBL) primary responsibility is to provide transportation services to residents of Montebello and neighboring cities. MBL is the third largest municipal bus system in Los Angeles County, behind Long Beach Transit and Santa Monica's Big Blue Bus. With a fleet of 66 buses, MBL serves over 8 million passengers a year throughout the communities of Alhambra, Bell Gardens, Boyle Heights, Commerce, Downtown Los Angeles, East Los Angeles, La Mirada, Montebello, Monterey Park, Pico Rivera, Rosemead, South Gate and Whittier.