Main Street is a historic street in Yarmouth, Maine, United States. It is part of the 18-mile-long (29 km) State Route 115 (SR 115), the eastern terminus of which is in Yarmouth at the intersection of Marina Road and Lafayette Street (SR 88), at Yarmouth Harbor in the Lower Falls area. Its western end is a merging with Walnut Hill Road in North Yarmouth, at which point SR 115 continues west. The annual Yarmouth Clam Festival attracts around 120,000 people (around fourteen times its population) over the course of the three-day weekend and is centered on Main Street.