Northumberland is a town located in western Coös County, New Hampshire, United States, north of Lancaster. It is part of the Berlin, NH–VT micropolitan statistical area. As of the 2020 census, the town population was 2,126, of whom 1,068 lived in the village of Groveton.
Elevation: 860 ft (260 m)
Country: United States
State: New Hampshire
County: Coös
Incorporated: 1779
Villages: Groveton · Northumberland
ZIP code: 03582 (Groveton/Northumberland) · 03584 (Lancaster)
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