Dunellen is located in the county of Middlesex. The city covers a total area of 2.715 sq. km. The business community has grown in leaps and bounds with the development of businesses related to supplies of art materials, auto painting and repair, auto transport, boat repairing, household cleaning, computer networking, courier service, health services, manufacturing of furniture, industrial and commercial machinery, landscape contracting, metal fabrication, contracting in plumbing and contracting in sheet metal work. Services related to website designing, repair of television and radio, road side, investment advisory and counseling continue to serve the growing community of Dunellen.