Haddam [Middlesex County] was settled in 1662 and incorporated and named in 1668 from Much Haddam parish in Hertfordshire. Area, 46.4 sq. miles. Population, est., 7,210. Voting districts, 4. Principal industries, marinas, and manufacture of metal-working machinery, yacht design, environmental consulting, printed circuits, wire products, plastics, molding, extruding and offset printing.Haddam includes the villages of Haddam Neck and Higganum.