For those who may not be familiar with Holbrook:
Holbrook is a hamlet (an unincorporated area) partly in the east section of the Town of Islip and partly in the west section of the Town of Brookhaven, just a bit west of the central part of Suffolk County.
Beginning on the north and moving in a clockwise direction, the Hamlet of Holbrook partly in the Town of Islip and partly in the Town of Brookhaven is bordered on the north by Hamlet of Lake Ronkonkoma, the Hamlet of Centereach and the Hamlet of Holtsville in the Town of Brookhaven; on the east by the Hamlet of Holtsville in the Town of Islip and the Hamlet of North Patchogue in the Town of Brookhaven; on the south by the Hamlet of Bayport and the Hamlet of Sayville in the Town of Islip; and, on the west by the Hamlet of Bohemia, the Hamlet of Ronkonkoma and the Hamlet of Lake Ronkonkoma in the Town of Islip.
The Hamlet of Holbrook has a different border than does the "Holbrook, NY 11741" ZIP Code postal zone (i.e., a place can have a "Holbrook, NY 11741" mailing address and not be in the Hamlet of Holbrook and a place can have other than a "Holbrook, NY 11741" mailing address and be in the Hamlet of Holbrook): places that have a "Holbrook, NY 11741" mailing address that are not in the Hamlet of Holbrook are in the Hamlet of Lake Ronkonkoma, the Hamlet of Holtsville and the Hamlet of North Patchogue; and, at the same time, there are places in the Hamlet of Holbrook with a "Bohemia, NY 11716" mailing address.
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