Newbury is a town in Merrimack County, New Hampshire, United States. The population was 2,072 at the 2010 census. Newbury is home to part of Lake Sunapee, including Mount Sunapee State Park Beach. Mount Sunapee Resort, a ski area in Mount Sunapee State Park, is in the west. The town includes the villages of Blodgett Landing and South Newbury.

Situated at the south end of Lake Sunapee, this town has gone through numerous name changes. It started in 1753 as "Dantzic", after the Baltic seaport. The first provincial grant in 1754 named the town "Hereford", in honor of Edward Devereaux, Viscount Hereford. Colonial Governor John Wentworth renewed the grant in 1772 under the name "Fishersfield", for his brother-in-law, John Fisher. The town was finally incorporated as "Newbury" in 1837, as suggested by settlers originally from Newbury, Massachusetts.

The Fells Historic Site, located adjacent to the John Hay National Wildlife Refuge, is part of 876 acres (3.55 km²) protected of a forest country estate. Protection efforts have enabled Lake Sunapee to consistently be named one of the cleanest lakes in the state.

According to the United States Census Bureau, the town has a total area of 38.1 square miles (99 km²), of which 35.8 sq mi (93 km²) is land and 2.3 sq mi (6.0 km²) is water, comprising 6.01% of the town. Mount Sunapee, the highest point in town, has an elevation of 2,726 feet (831 m) above sea level.

The village of Newbury is located at the south end of Lake Sunapee near the geographic center of the town. The village is at the junction of New Hampshire Route 103 and 103A. Route 103 leads northwest, past the entrance to Mount Sunapee Resort (a state park) and into the town of Sunapee. To the southeast, Route 103 passes the village of South Newbury before entering the town of Bradford. Route 103A proceeds north, parallel to the east shore of Lake Sunapee, and passes the village of Blodgett Landing before entering the town of New London.

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