Brentwood Bay is part of the Central Saanich Municipality (pop. 15,348 (2001)), one of 13 that make up the Greater Victoria area (pop. 344,615 [1]). It is located on Highway 17A just west of Highway 17 (known locally as the "Pat Bay Highway"), the main route running the length of the Saanich Peninsula. It is also served frequently by the Brentwood-Mill Bay ferry, the MV Mill Bay, run by BC Ferries.