N.C. Gen. Stat. § 54B-188: Municipal and county obligations.

A State association may invest in bonds or other evidences of indebtedness which 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 which are payable from revenues or earnings specifically pledged therefor, which are issued by the county or an adjoining county or a political subdivision or municipal corporation of a county in this State. (1981, c. 282, s. 3.)