Black Rock is the southwestern- most neighborhood in Bridgeport directly east of Fairfield, CT. The neighborhood includes one historic district. Originally established as part of Fairfield, CT, Black Rock, and especially Black Rock Harbor, were once that town’s leading port. According to the bylaws enacted by the Black Rock NRZ Planning Committee, Metro North’s railroad tracks make up the neighborhood’s northern boundary; the southern boundary is the Long Island Sound (specifically, Black Rock Harbor); the eastern boundary is made up of Bostwick Avenue and Pine Street; and the western boundaries are the Fairfield town line and Ash Creek. The neighborhood consists of US Census Tracts 701, 702, and part of 703.