It is located south of Merrick Road (or Montauk Highway), off of South Great Neck Road in Suffolk County, New York, USA, on the South Shore of Long Island.

Copiague Harbor is a small community located on a southern peninsula of Copiague, primarily composed of larger size homes deeded belonging to a homeowners' association, Great South Bay Estates Homeowner's Association (GSBEHA).

[1] The community offers amenities including a mini-beach and mini-marina on a private lagoon.

[1] It was developed in the 1960s intended as a private community, gated and guarded.

[3][4] As such, all children who reside within Copiague Harbor and attend public schools attend Copiague's schools.