Oceanside is a hamlet and census-designated place (CDP) located in the southern part of the town of Hempstead, Nassau County, New York, United States.

[2] Originally known as South Bay, the English government established a township there in 1674 called Christian Hook, basing the name on the predominant religious affiliation of colonists in the area.

Columbia Engine Co. #1, an old firehouse, still exists, and is located at the southwest corner of the triangle where Lincoln Avenue meets Long Beach Road.

Nathan's Famous opened its second restaurant on June 4, 1959, on Long Beach Road in Oceanside, taking over the site of the once-popular Roadside Rest, which had opened several decades before and had offered live entertainment and dancing on a large dance floor as well as Nathan's-type frankfurters and locally caught seafood.

[4] There was a large Nathan's building with play areas and a big open dining room that had a stage.

A modern Nathan's franchise subsequently opened on a small section of the original property, at the corner of Long Beach Road and Windsor Parkway.

This was proven in 2012, when Oceanside saw its worst natural disaster when Hurricane Sandy hit the area.

The storm completely flooded the southern portion of the town with areas as far north as Nathan's reporting waves of water rushing down streets.

[5] Sandy also knocked out power for nearly two weeks after a substation in the nearby town of Island Park exploded.

Oceanside was one of the many towns upset with the slow response from the Long Island Power Authority and held a rally because of it.

[6] As of 2019, Oceanside still has many who are dealing with the consequences of Sandy, and some have begun leaving, with the value of houses remaining high.

In 2014, after years of speculation and lack of business, Nathan's announced it was moving to a smaller location on the corner of Long Beach Road and Merle Avenue (near the former Chwatsky's).

[7] Eventually, the Town of Hempstead approved this move and The original building was officially closed on January 4, 2015.

[10] Oceanside has a humid subtropical climate (Cfa) and average monthly temperatures in the village centre range from 32.1 °F in January to 74.8 °F in July.

Most of the town before this, was a small sea port near the more established villages of Rockville Centre, Baldwin, and East Rockaway.

Sunrise Highway (NY 27) is located along the Northern border of the hamlet, with Rockville Centre and Baldwin.

Despite Democratic Victories in the past, Donald Trump won the popular vote in Oceanside in the 2016 election.