Alexandria is a town in Grafton County, New Hampshire, United States. The population was 1,776 at the 2020 census, up from 1,613 at the 2010 census. Newfound Lake is in the northeast corner, with Wellington State Park on the western shore. The town is home to Welton Falls State Forest. Cardigan Mountain State Park, with Mount Cardigan, is in the west. Another attraction is Mowglis Mountain, named for Rudyard Kipling's Jungle Book hero.

Grafton County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 91,118. Its county seat is the town of Haverhill. In 1972, the county courthouse and other offices were moved from Woodsville, a larger village within the town of Haverhill, to North Haverhill.