Lexington is a suburban town in Middlesex County, Massachusetts, United States, located 10 miles from Downtown Boston. The population was 34,454 as of the 2020 census. The area was originally inhabited by Native Americans, and was first settled by Europeans c. 1642 as a farming community. Lexington is well known as the site of the first shots of the American Revolutionary War, in the Battle of Lexington on April 19, 1775, where the "Shot heard 'round the world" took place.