The Port Madison Indian Reservation is an Indian reservation in northern Kitsap County, Washington. It occupies 30.273 km² (11.689 sq mi) on the western and northern shores of Port Madison, and is divided into two separate parcels by Miller Bay. The unincorporated towns of Suquamish and Indianola both lie within the bounds of the reservation. A resident population of 6,536 persons was counted in the 2000 census.