Hannawa Falls is a hamlet and census-designated place in St. Lawrence County, New York, United States.

[1] Hannawa Falls has a post office with ZIP code 13647.

[1] The census-designated place is mostly in the Potsdam Central School District.

A portion of the census-designated place is in the Parishville-Hopkinton Central School District.

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