| Official Name: | Hannawa Falls, New York |
| Pushpin Map: | New York#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | St. Lawrence |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 5.412 |
| Area Land Sq Mi: | 5.110 |
| Area Water Sq Mi: | 0.302 |
| Population As Of: | 2010 |
| Population Total: | 1042 |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 558 |
| Coordinates: | 44.6122°N -74.9711°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 13647 |
| Area Code: | 315 & 680 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 976407 |
Hannawa Falls is a hamlet and census-designated place in St. Lawrence County, New York, United States. Its population was 1,042 as of the 2010 census.[1] Hannawa Falls has a post office with ZIP code 13647.[2] [3] New York State Route 56 passes through the community.
According to the U.S. Census Bureau, the community has an area of ; of its area is land, and is water.[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.[4]