Located in the foothills of the Santa Susana Mountains, Porter Ranch is a highly affluent suburban community within the northwestern San Fernando Valley region of Los Angeles. Chatsworth is located to the south and west, Northridge to the south, and Granada Hills to the northeast and east. The Santa Susana Mountains, which separate the San Fernando Valley from the Santa Clarita Valley are directly to the north.
Porter Ranch, Hidden Hills, Calabasas, and Encino are the three most affluent communities in the San Fernando Valley. Parks in Porter Ranch include Palisades Park, Aliso Canyon Park, Rinaldi Park, Viking Park, Porter Ridge Park, Limeklin Canyon Park, Moonshine Canyon Park, and Holleigh Bernson Memorial Park.