N.D. Cent. Code § 61-24-27
Notwithstanding any other provision of law, the state and all public officers, boards, and agencies, and political subdivisions and agencies of the state, including the public finance authority, all national banking associations, state banks, trust companies, savings banks and institutions, savings and loan associations, credit unions, investment companies, insurance companies, and other entities carrying on an investment business, and executors, administrators, guardians, trustees, and other fiduciaries, may legally invest any sinking funds, moneys, or other funds belonging to them or within their control in any bonds issued under this chapter, and the bonds are authorized security for public deposits. Notes and bonds, including refunding bonds, issued under this chapter and their interest and income are exempt from all taxation by the state or by any political subdivision except inheritance, estate, and transfer taxes.
N.D.C.C. § 61-24-27