Below is a list of the types of businesses in the City of Holtsville in which we have business listings. If you do not see your city within the list below. You can add a business for just $49.95 per year. To add a business submit your info here.
Holtsville is a hamlet and census-designated place located in Suffolk County, New York, United States. Holtsville lies mainly in the Town of Brookhaven, while the southwest portion is in the Town of Islip. An IRS Processing Center is located in Holtsville. Main attractions include Harold H. Malkmes Wildlife Education and Ecology Center, a public zoo, and an ecological park located on the site of a previous landfill. Holtsville's zip codes are 00501, 00544, and 11742.