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.