South Jamesport is a hamlet in the town of Riverhead, Suffolk County, New York, United States.

The community is located on the north shore of the Great Peconic Bay.

South Jamesport has a post office with ZIP code 11970, which opened on February 2, 1893.

[2][3] On South Jamesport beach there are different types of sand, black sand and golden sand.

This article about a location in Suffolk County, New York is a stub.