The village of Greenville is in the western part of the CDP, on both sides of the Souhegan River.

The CDP boundary follows the Greenville town line to the north, east, and west.

[3] New Hampshire Route 31 is the main road through the CDP, passing east of the village center.

According to the U.S. Census Bureau, the Greenville CDP has a total area of 3.4 square miles (8.9 km2), all land.

34.8% of all households were made up of individuals, and 14.2% were someone living alone who was 65 years of age or older.