New Hampshire Route 109 is a 41.029-mile-long (66.030 km) north–south highway in Carroll County, New Hampshire. It runs southeast from Sandwich to the Maine border.

Sandwich is a town in Carroll County, New Hampshire, United States. Its population was 1,466 at the 2020 census. Sandwich includes the villages of Center Sandwich and North Sandwich. Part of the White Mountain National Forest is in the north, and part of Squam Lake is in the southwestern corner of the town. As such, Sandwich lies on the boundary between New Hampshire's Lakes Region and White Mountains Region. The Sandwich Range of the White Mountains lies partially within the town, as does the namesake Sandwich Mountain. The town is home to the Sandwich Fair, a popular agricultural fair that occurs every October.