Londonderry is an unincorporated village and census-designated place in the town of Londonderry, Windham County, Vermont, United States. As of the 2020 census, it had a population of 180, compared to 1,919 in the entire town. The CDP is in northwestern Windham County, in the northern part of the town of Londonderry. It sits in the valley of the West River, where it is joined from the north by Utley Brook. The West River is a south-flowing tributary of the Connecticut River.