According to the United States Census Bureau, the town has a total area of , of which is land and is water, comprising 6.37% of the town [REF].
The two primary settlements in town are Center Ossipee, located near the southern junction of routes 16 and 25, and Ossipee Corner (shown as "Ossipee" on topographic maps), located south of Center Ossipee at the junction of routes 28 and 171 and close to Route 16.