Penacook, originally called "Fisherville", is a village within the city of Concord in Merrimack County, New Hampshire, United States. It lies along Concord's northern border with Boscawen. The name comes from the Pennacook tribe that lived in the area. "Penacook" was the original name of the plantation incorporated by present-day Concord. Penacook is located along a stretch of the Contoocook River that falls 100 feet in slightly over 1 mile, just before joining the Merrimack River.