Station Four is located in a neighborhood near the Harbor Bay Ferry Terminal. Residing in its current Mecartney Road quarters since 1991, the engine company and ambulance there protect the Bay Farm Island area of Alameda. The engine at Station Four is also part of the mutual response area agreement with the Oakland Fire Department to the Oakland International Airport, providing response to aircraft emergencies and fires at the airport and immediate surrounding areas. In return, the Oakland Fire Department provides an engine company for structure fire incidents that occur on Bay Farm Island.