Hollis is a town in Hillsborough County, New Hampshire, United States. The population was 7,684 at the 2010 census. The town center village is listed on the National Register of Historic Places as Hollis Village Historic District. Hollis was a station stop on the Worcester & Nashua Railroad, who built their line through town in 1848 as part of a through route between Worcester, Massachusetts and Portland, Maine. The line was later acquired in 1886 by the Boston & Maine Railroad. The WN&P from Hollis to Nashua, New Hampshire was abandoned in 1941, and the B&M subsequently renamed the remaining line south to Ayer, Massachusetts the Hollis Branch.
The B&M continued to provide freight service until the Hollis Branch was abandoned in 1982, with a fuel dealer being the last rail customer in town.According to the United States Census Bureau, the town has a total area of 32.3 square miles (84 km2), of which 31.8 sq mi (82 km2) is land and 0.6 sq mi (1.6 km2) is water, comprising 1.76% of the town. The highest point in Hollis is the summit of Birch Hill, at 821 feet (250 m) above sea level, located near the town’s western border.The Nashua River flows through the southeast corner of the town out of Pepperell, Massachusetts and into Nashua. The Nissitissit River flows through the western part of the town. Hollis lies fully within the Merrimack River watershed.
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