Port Madison is a community of Bainbridge Island, Washington. It is located on the northeast part of the island. Port Madison's boundaries are ill-defined, altlhough it generally is limited to the eastern part of Port Madison (the water body). Areas to the west and south of Port Madison (the water body) are also referred to as Port Madison, although they are rather far from the community's centre. The communities of Hidden Cove and Allen Cove are also in the general area.
Port Madison should not be confused with the Port Madison Indian Reservation.