Montville is a town in New London County, Connecticut in the United States. The population was 18,387 at the 2020 census. The villages of Chesterfield, Mohegan, Oakdale, and Uncasville are located within the town; the latter two have their own ZIP Codes. Town residents often identify with these villages more than the Town of Montville as a whole. The Mohegan Sun casino resort is located in the village of Uncasville. History In the 17th century, when English settlers arrived, southeastern Connecticut was the scene of rivalry between the Pequot people, the dominant Native American group in the New London area, and the newly independent Mohegan. The latter became friendly to the English. For defense against the Pequot, the Mohegan sachem Uncas had established a fortified village on a promontory above the Thames River within what is now the town of Montville. The Mohegan village, now known as Fort Shantok, was protected on the inland side by palisades first built in about 1636 at the time of the Pequot War, rebuilt during wars with the Narragansett people –1657, and rebuilt again at the time of King Philip's War (1675–1676). When the boundaries of New London (then called "Pequot") were first defined in 1646, the Oxoboxo River formed the northern boundary. Parts of the modern town of Montville lying south of the river were included in New London, while the area north of the river was treated as Mohegan land. Over time the settlers assumed control of the Mohegan lands. The first grants were made by Uncas in 1658 to Richard Houghton and James Rogers, consisting of valuable farms along the river. Some Mohegan grants were gifts of friendship or by fair trade, while others were openly fraudulent. By 1703 the area between the Oxoboxo River and Norwich (now part of the town of Montville) was annexed by New London. In 1786 Montville was separated from New London and incorporated as a separate Town. Before incorporation, it was known as the North Parish of New London. In 1819 the adjacent Town of Salem was formed from parts of the towns of Montville, Lyme, and Colchester. The name "Montville" signifies "mountain village". National Register of Historic Places Four properties in town are listed on the National Register of Historic Places: Bridge No. 1860 on Massapeag Side Rd. (Rt. 433) over Shantok Brook, Fort Shantok SP (added August 29, 1993) Fort Shantok Archeological District