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is a hamlet (and census-designated place) in Clinton County, New York, United States. The population was 1,702 at the 2000 census.
Morrisonville is divided between the Towns of Plattsburgh and Schuyler Falls by the Saranac River, which defines the town lines between the two towns. The community is west of the City of Plattsburgh.
According to the United States Census Bureau, the CDP has a total area of 2.7 square miles (6.9 km²), of which, 2.6 square miles (6.7 km²) of it is land and 0.1 square miles (0.2 km²) of it (3.36%) is water.