Wellfleet is a town on Cape Cod in Massachusetts. The town had a population of 3,566 at the 2020 United States census, which swells nearly sixfold during the summer. A total of 70% of the town's land area is under protection, and nearly half of it is part of the Cape Cod National Seashore. Wellfleet is famous for its oysters, which are celebrated in the annual October Wellfleet OysterFest.