Green's Grant is a township in Coös County, New Hampshire, United States. As of the 2020 census, the grant had a population of zero. The grant lies within the White Mountain National Forest. The base of the Mount Washington Auto Road is located in Green's Grant.

Coös County or Coos County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 31,268, making it the least-populated county in the state. The county seat is Lancaster.