After another 0.2 mile (0.4 km), at mile 27.7 (44.5 km), Mammoth Road crosses the county line into Merrimack County and the town of Hooksett.
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At mile 10.3 (16.6 km) Mammoth Road (NH-128) crosses the county line into Rockingham County and into the town of Windham.
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In New Hampshire the road becomes New Hampshire Route 128 (NH-128) in the town of Pelham, Hillsborough County.
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