Massachusetts House of Representatives' 21st Middlesex district in the United States is one of 160 legislative districts included in the lower house of the Massachusetts General Court.
It covers part of Middlesex County.
[1] Democrat Ken Gordon of Bedford has represented the district since 2013.
[2] The district includes the following localities:[3] The current district geographic boundary overlaps with those of the Massachusetts Senate's 1st Essex and Middlesex district, 3rd Middlesex district, and 4th Middlesex district.
[4] The district previously covered: