East Patchogue is a census-designated place (CDP) in the Suffolk County town of Brookhaven, New York, United States. The population was 22,469 at the 2010 census. The CDP is a proximate representation of the East Patchogue hamlet used for statistical purposes of the Census Bureau.
Patchogue has historically been a major shopping and commerce hub of Suffolk County. "Patchogue" in the narrow sense is an incorporated village with narrow limits, only about a mile and a half wide. East Patchogue includes the eastern portion of Patchogue in the wider sense, as well as the area east of that but still west of the incorporated village of Bellport. This double meaning of "East Patchogue" is reflected in the naming of New York State Route 27A: It is called "East Main Street" in the western portion of East Patchogue, and "Montauk Highway" (as it typically is outside of villages) in the eastern portion. The Patchogue side of East Patchogue is in the Patchogue-Medford School District; the Bellport side is in the South Country Central School District, and its high-school students attend Bellport High School. Some maps even refer to southwestern East Patchogue as West Bellport. The northern part of East Patchogue, which until the 1980s was less developed, has sometimes been referred to as South Medford.