The town was one of several chartered in 1761 by Benning Wentworth, colonial governor of New Hampshire. It was his custom to name new towns after prominent English aristocrats of the day, hoping they might adopt a patronly interest in their namesakes. Wentworth named Manchester for Robert Montagu, 3rd Duke of Manchester. First settled in 1764, the town was laid out in 1784. The land was better suited for grazing than tillage, so by 1839 about 6,000 sheep roamed the pastures and hillsides.