Sunderland is a town in Bennington County, Vermont, United States. The population was 1,056 at the 2020 census. It is home to the mail-order company Orvis. Sunderland is located on the eastern side of Bennington County, approximately halfway between the northern and southern ends of the county. It is bordered by the town of Manchester to the north, Arliā¦Sunderland is a town in Bennington County, Vermont, United States. The population was 1,056 at the 2020 census. It is home to the mail-order company Orvis. Sunderland is located on the eastern side of Bennington County, approximately halfway between the northern and southern ends of the county. It is bordered by the town of Manchester to the north, Arlington to the west, the unincorporated town of Glastenbury to the south, and the town of Stratton in Windham County to the east.