Sargent's Purchase is a township in Coös County, New Hampshire, United States. It lies within the White Mountain National Forest, and the summit of Mount Washington is located within the township. As of the 2020 census, the population was zero. In May 1866, 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.
Geography
The township is in the White Mountains of New Hampshire and includes the summit of Mount Washington, the highest mountain in New England, with an elevation of above sea level. Other notable summits within the purchase include Mount Monroe, at ; Mount Isolation, at ; and Stairs Mountain, at . The Appalachian Trail crosses the northwestern part of the township, including the summit of Mount Washington, as well as the northeastern corner of the township.
According to the United States Census Bureau, the township has a total area of , of which , or 0.02%, are water.
As of the 2020 census, there were no permanent residents in the township.