For those who may not be familiar with Bayville:
Bayville is a village (incorporated in 1919) in the northern part of the Town of Oyster Bay, in the northeast part of Nassau County.
Beginning on the north and moving in a clockwise direction, the Village of Bayville in the Town of Oyster Bay is bordered on the north by Long Island Sound; on the east by the Village of Centre Island; on the south by the Oyster Bay, Mill Neck Creek and the Village of Mill Neck; and, on the west by the Village of Lattingtown and the Hamlet of Locust Valley.
The Village of Bayville has a different border than does the "Bayville, NY 11709" postal zone (i.e., a place can have a "Bayville, NY 11709" mailing address and not be in the Village of Bayville): places with a "Bayville, NY 11709" mailing address that are not in the Village of Bayville are in the Village of Mill Neck and the Hamlet of Locust Grove.
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