N.C. Gen. Stat. § 54C-137: Municipal and county obligations.

A savings bank may invest in bonds or other evidences of indebtedness that are direct general obligations of any county, city, town, village, school district, sanitation, or park district, or other political subdivision or municipal corporation of this State; or in bonds or other evidences of indebtedness that are payable from revenues or earnings specifically pledged therefor, which are issued by a county or a political subdivision or municipal corporation of a county in this State. (1991, c. 680, s. 1.)