N.D. Cent. Code § 21-04-06
In a county where only one financial institution is located or functioning, the board may designate such financial institution as a depository, or it may designate another financial institution or financial institutions, within the state, or the Bank of North Dakota, as depository in the manner and upon the conditions provided in this chapter. In a county where no financial institution is in existence or functioning, the board may designate the Bank of North Dakota, or any financial institution, outside of such county and within the state, as depository in the manner and upon the conditions provided in this chapter for the selection of depositories of public funds. In case there is no financial institution within any city, township, or school district, the governing board thereof, if it deems it more advantageous and for the best public interest and convenience, may select as a depository a conveniently located financial institution in an adjoining county, which thereupon shall qualify as a depository by giving such bond as is required from a financial institution within said county. Said bond must be approved by such governing board as to sufficiency and by the state's attorney of the county in which such city, township, or school district is located as to form and must be deposited in the office of the county auditor of such county.
N.D.C.C. § 21-04-06