R.I. Gen. Laws § 32-2-1: Area included in district.

The jurisdiction and powers of the director of environmental management, insofar as the jurisdiction and powers relate to metropolitan parks, shall extend to, and may be exercised in, the cities of Providence, Pawtucket, Cranston, Warwick, and Central Falls; the towns of East Providence, Johnston, North Providence, Lincoln, and Barrington; and the voting districts numbers three (3), four (4), and five (5) in the town of Cumberland. Those cities, towns, and voting districts shall constitute the metropolitan park district.