Concord is a town located in Middlesex County, Massachusetts, within the United States. It is officially recognized by the United States Census Bureau as part of the Greater Boston area.
The town has a population of 18,491 according to the 2020 census and includes the census-designated place of West Concord. The geographic center of the town is situated near the confluence of the Sudbury and Assabet rivers, which join to form the Concord River.