Kingston is a town in Rockingham County, New Hampshire, United States. The population at the 2020 census was 6,202. Kingston was the fifth town to be established in New Hampshire. Originally, it was a part of Hampton. After King Philip's War, the establishment of new settlements was made possible by peace treaties with the local Indian tribes and, in 1692, b…Kingston is a town in Rockingham County, New Hampshire, United States. The population at the 2020 census was 6,202. Kingston was the fifth town to be established in New Hampshire. Originally, it was a part of Hampton. After King Philip's War, the establishment of new settlements was made possible by peace treaties with the local Indian tribes and, in 1692, by geographical and jurisdictional agreements between the provinces of Massachusetts Bay and New Hampshire. Consequently, certain residents of Hampton petitioned for a grant of a separate township to be created from the western part of Hampton. And so, in 1694, King William III of England granted a royal charter establishing the town of "Kingstown", so named in honor of the King. Use of the title rather than the King's name was common at the time. The original charter exists to this day.