According to the United States Census Bureau, the town has a total area of 52.5 square miles (136.0 km²), of which, 52.5 square miles (135.9 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.10%) is water.
NY Route 29 joins NY Route 22 at Greenwich Junction, and Route 22 continues north into the town of Hebron, New York.