Sargent's Purchase, New Hampshire
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In New Hampshire, locations, grants, townships (which are different from towns), and purchases are unincorporated portions of a county which are not part of any town or city and have limited self-government (if any, as many are uninhabited).
The first known explorer to have stepped foot in what is now known as Sargent’s Purchase was Darby Field, who claimed to have made the first ascent of Mount Washington in 1642. Sargent’s Purchase was granted to Jacob Sargent and others on May 31, 1832. In 1857, Sylvester Marsh of Campton, New Hampshire began construction of the Mount Washington Cog Railway, primarily in Thompson and Meserve's Purchase, but the uppermost half mile being within Sargent's Purchase. The Cog Railway was completed in 1869.
According to the United States Census Bureau, the township has a total area of 25.9 square miles (67 km2), of which 0.04% is water.
Mount Washington, with an elevation of 6,288 feet (1,917 m) above sea level, the highest mountain in New England, is located in Sargent's Purchase. Other notable summits within the purchase include Mount Monroe, at 5,380 feet (1,640 m); Mount Isolation, at 4,004 feet (1,220 m); and Stairs Mountain, at 3,468 feet (1,057 m). The Ammonoosuc River has its headwaters in the township.