Eaton Vance Insured Massachusetts Municipal Bond Fund operates as a nondiversified, closed-end management investment company in the United States. It primarily invests in high grade municipal obligations. The fund's investment portfolio comprises investments in companies operating in various sectors, including hospitals, electric utilities, housing, education, water and sewer, and transportation. Eaton Vance Management serves as the investment advisor of the fund. Eaton Vance Insured Massachusetts Municipal Bond Fund was organized in 2002 and is based in Boston, Massachusetts.