Methuen (mĭthōˈən) [key], town (1990 pop. 39,990), Essex co., NE Mass., a suburb of Boston; settled c.1642, set off from Haverhill 1725. Methuen is industrial, and among its products are food items, computer and microwave components, medical suplies, and textiles. The Tenney Estate was converted into St. Basil's Seminary and Presentation of Mary Academy.