Marystown, NL, incorporated as a town in 1951, population 5506 (2011c), 5436 (2006c). The Town of Marystown is a shipbuilding and fish-processing centre, comprising the settlements of Marystown (formerly Mortier Bay), Creston, Creston North, Little Bay and Mooring Cove on the east side of the Burin Peninsula. Marystown, having one of the largest and deepest natural harbours in Newfoundland, has been promoted historically as an ice-free port. Probably frequented by French and BASQUE fishermen in the 16th and 17th centuries, the area was settled predominantly by English and Irish fishermen by the early 1800s. The origin of the name is not known but may honour Mary, the mother of Jesus.

In 1966 a shipyard and fish plant were constructed, providing much-needed alternative employment. The yard is one of the most efficient and best-equipped shipbuilding and ship-repair facilities of its size in North America. Marystown is also the commercial centre for the Burin Peninsula. All highways and main roads on the Burin Peninsula pass through Marystown.