New Hampshire's ghost towns are mostly logging camps, hill farms and early settlements gone back to forest. Wikipedia's list names 70, from White Mountain logging villages to unpeopled grants in Coos County. Monson, founded in 1737, was one of New Hampshire's first inland settlements; it was abandoned in 1770, a loss usually blamed on its poor soil. Cellar holes remain in a Forest Society reservation.
Livermore, the best known, was the Saunders family's sawmill town on the Sawyer River, incorporated in 1876 with its own railroad. It peaked at 191 people in 1900, its last mill closed in 1928, the last residents left in 1949, and the legislature dissolved it in 1951. The land is now White Mountain National Forest.
Offshore, the fishing township of Gosport on Star Island lost most of its people when the Shoals were evacuated in the Revolution, and the island was annexed to Rye in 1876; its 1800 stone chapel still stands. Two Shaker villages also emptied: Enfield's Shakers left in 1923, and Canterbury's last Shaker sister died in 1992. Both are museums now.