New Hampshire Route 136 passes through the center of the community, leading east 7 miles (11 km) to New Boston and southwest 4 miles (6 km) to Greenfield.

New Hampshire Route 47 has its southern terminus in Francestown and leads northwest 7 miles (11 km) to Bennington.

Second New Hampshire Turnpike, a local road, leads southeast 9 miles (14 km) to Mont Vernon.

According to the U.S. Census Bureau, the Francestown CDP has a total area of 0.93 square miles (2.4 km2), all land.

[4] The South Branch Piscataquog River, here a large brook, runs through the east side of the CDP and is part of the Merrimack River watershed.