Plymouth (historically known as Plimouth and Plimoth) is a town in Plymouth County, Massachusetts, United States. It is the largest municipality in Massachusetts by area. The population was 51,701 at the 2000 census, with an estimated 2009 population of 58,681. Plymouth is one of two county seats of Plymouth County, the other being Brockton. It is named after Plymouth, Devon, United Kingdom, which is, in turn, named after its location at mouth of the River Plym. Plymouth is best known for being the site of the colony established by the Pilgrims, passengers of the Mayflower. Founded in 1620, Plymouth is the oldest municipality in New England and one of the oldest in the United States. It also is the oldest continually inhabited English settlement in the modern United States. The town has served as the location of several prominent events, the most notable being the First Thanksgiving feast. Plymouth served as the capital of Plymouth Colony from its founding in 1620 until the colony's dissolution in 1691. Plymouth is located approximately 40 miles (64 km) south of Boston in a region of Massachusetts known as the South Shore. Throughout the 19th century, the town thrived as a center of ropemaking, fishing, and shipping, and once held the world's largest ropemaking company, the Plymouth Cordage Company. While it continues to be an active port, today the major industry of Plymouth is tourism. Plymouth is served by Plymouth Municipal Airport, and contains Pilgrim Hall Museum, the oldest continually operating museum in the United States. As one of the country's first settlements, Plymouth is well-known in the United States for its historical value. The events surrounding the history of Plymouth have become part of the mythology of the United States, particularly those relating to Plymouth Rock, the Pilgrims and the First Thanksgiving.