Holtsville holds the distinction of having the lowest ZIP code (00501) in the United States, home to a major IRS Processing Center. This Long Island hamlet spans 7.1 square miles across both Brookhaven and Islip towns, offering residents a convenient suburban setting with access to unique local attractions like the Harold H. Malkmes Wildlife Education and Ecology Center, which features a public zoo, ecological park, and recreational facilities.

Rental options in Holtsville include townhomes and small apartment communities, with average monthly rents of $2,411 for one-bedroom units and $3,124 for two-bedroom homes. The area features a median household income of $125,534 and provides convenient access to employment centers throughout Long Island. The community offers a balanced mix of residential neighborhoods and commercial areas, with shopping centers and dining establishments providing everyday conveniences.

Commuters benefit from Holtsville's strategic location near major thoroughfares like the Long Island Expressway (I-495) and Veterans Memorial Highway. While the hamlet's own LIRR station closed in 1998, residents have easy access to nearby Ronkonkoma and Medford stations for rail service to Manhattan. The area is served by the Sachem School District, complementing its residential neighborhoods and rental communities.