Holtsville is a hamlet and census-designated place (CDP) in Suffolk County, New York. The population was 19,714 at the 2010 census. Holtsville is mainly in the Town of Brookhaven, while the southwest portion is in the Town of Islip. An IRS Processing Center is located in Holtsville also. The community was named after Joseph Holt, postmaster general.
Algonquian-speaking Native Americans were the first to live in the area, and Europeans settled it in the late 1600s. This settlement developed into a small farming community by the late 18th century. With the village originally named Waverly, 1843 saw the construction of the Waverly Train Station. Due to another post office using this name, the village switched to the name Holtsville in 1860.
Holtsville was a station stop on the Greenport Branch of the Long Island Rail Road. It was located off of the southeast corner of the Waverly Avenue grade crossing on the south side of the tracks between Long Island Avenue and Furrows Road in Holtsville, New York. The station first opened in a local store as Waverly around 1843. Although the surrounding area was renamed Holtsville in 1860 when a post office opened, the station retained the name "Waverly" until the 1890s, when farmers complained about their shipments going to an upstate town named Waverly by mistake. Holtsville Station was rebuilt on May 13, 1912, only to be burned in another fire on January 4, 1914, and replaced again later the same year South of the station was the northern terminus of the Suffolk Traction Company's main trolley line, which was proposed to be extended to Port Jefferson, New York, across a bridge over the tracks before the company went bankrupt in 1919. The station building was bulldozed in June 1962, but the station itself continued to operate until March 16, 1998, when it was closed along with several others due to low usage, which didn't make it very cost effective to install high-level platforms needed to support the then-new C3 bi-level coaches.
Holtsville residents enjoy a mostly suburban space, with very safe living areas that have maintained their charm for decades. The restaurants and stores around Holtsville sufficiently satisfy locals, and the roads allow for easy access to neighboring villages for additional options. The Long Island Expressway passes through Holtsville, making it easy for commuters to travel to and from work. The school district in Holtsville rates highly, providing another advantage to raising a family in this attractive village.
Getting around in Holtsville is expedient due to its position near major roadways. For example, the village encircles New York State Route 495 Long Island Expressway, the most important commuter highway in the vicinity. Holtsville is mostly a residential community with few open areas left to build on so it's basically going to stay the same for a while into the future.
 Sayville Ford will always be there to service your automotive needs, if it's repair and service to buying a new car or truck, Sayville Ford is there for you.