Example image of eyePlorer eyePlorer map for 'Middlesex County, Massachusetts': County Massachusetts U.S. state 2000 United States Census Population Center of population Natick, Massachusetts Cambridge, Massachusetts County seat Lowell, Massachusetts Massachusetts Bay Colony Massachusetts General Court Shire Charlestown, Boston Concord, Massachusetts Medford, Massachusetts Reading, Massachusetts Sudbury, Massachusetts Watertown, Massachusetts Woburn, Massachusetts Billerica, Massachusetts Carlisle, Massachusetts Chelmsford, Massachusetts Dracut, Massachusetts Dunstable, Massachusetts Tewksbury, Massachusetts Tyngsborough, Massachusetts Westford, Massachusetts Wilmington, Massachusetts Square mile United States Census Bureau MetroWest Assabet River National Wildlife Refuge Census Great Meadows National Wildlife Refuge Hillsborough County, New Hampshire Longfellow National Historic Site Lowell National Historical Park Minute Man National Historical Park Oxbow National Wildlife Refuge Population density Race and ethnicity in the United States Census English people Irish people Italian people Chinese language English language French language Italian language Portuguese language