It seems that the general consensus favors Port Washington.
Everyone should bear in mind that about 3 out of every 5 places that have a "Port Washington, NY 11050" mailing address (6,652 acres) are not in the Hamlet of Port Washington (2,732 acres).
For those who may not be familiar with Port Washington:
Port Washington is a hamlet (an unincorporated area) in the northeast part of the Town of North Hempstead, in the northwest part of Nassau County.
Beginning on the north and moving in a clockwise direction, the Hamlet of Port Washington in the Town of North Hempstead is bordered on the north by the Village of Baxter Estates, the Village of Port Washington North and the Village of Sands Point; on the east by Hempstead Harbor; on the south by the Village of Flower Hill; and, on the west by the Village of Plandome Manor and Manhasset Bay.
Port Washington is one of those villages and hamlets on Long Island where the majority of the places with the community name as part of their mailing address are not in the hamlet: places that have a "Port Washington, NY 11050" mailing address that are not in the Hamlet of Port Washington are in the Village of Sands Point, the Village of Port Washington North, the Village of Manorhaven, the Village of Baxter Estates and the Village of Flower Hill (1931).
For a good set of town-by-town maps showing all the villages and hamlets in each of LI's 13 towns (3 in Nassau County and 10 in Suffolk County):
http://www.city-data.com/forum/long-...-resource.html