reggyn, that would be the northern part of Baldwin as there is no "North Baldwin" on the official maps of Nassau County.
For those who may not be familiar with Baldwin:
Baldwin is a hamlet (an unincorporated community) in the southern section of the Town of Hempstead, in the south-central part of Nassau County.
Beginning on the north and moving in a clockwise direction, the Hamlet of Baldwin in the Town of Hempstead is bordered on the north by the Village of Hempstead and the Hamlet of Uniondale; on the east by the Hamlet of Roosevelt and the Village of Freeport; on the south by the Hamlet of Baldwin Harbor; and, on the west by the Hamlet of Oceanside, the Village of Rockville Centre and the Hamlet of South Hempstead.
The Hamlet of Baldwin has a different border than does the "Baldwin, NY 11510" ZIP Code postal zone (i.e., a place can have a "Baldwin, NY 11510" address and not be in the Hamlet of Baldwin and a place can be in the Hamlet of Baldwin and have other than a "Baldwin, NY 11510" mailing address): places that have a "Baldwin, NY 11510" mailing address that are not in the Hamlet of Baldwin are in the Hamlet of Oceanside, the Hamlet of Baldwin Harbor and the Hamlet of Roosevelt; and, at the same time, there are places in the Hamlet of Baldwin that have an "Oceanside, NY 11572", "Rockville Centre, NY 11570" and "Roosevelt, NY 11575" 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):
Excellent Long Island Geographic Resource