Oceanside is a hamlet and census-designated place (CDP) located in the south part of the town ofHempstead, Nassau County, New York. The population was 32,109 at the 2010 census.
Originally known as South Bay, the English government established a township here in 1674 called Christian Hook, basing the name on the predominant religious affiliation of colonists in the area. Land development proceeded rapidly, and oyster sales took their place as a dominant force, with the local business "Mott's Landing" becoming a favorite place to buy oysters.In the nineteenth century, the town residents decided that "Oceanville" sounded better than "Christian Hook": it was "Oceanville Oysters" that sold, and in 1864, the new name became official. However, there was already an Oceanville in New York, so "Ocean Side," as two words, was adopted as the town's name in 1890. In the 1900s, the town began rapidly expanding south, building over Swamps and marshes and dramatically increasing the size of the town from a small port to a large hamlet. In 1918, The name was condensed to "Oceanside".