No person is eligible to any municipal office, elective or appointive: (1) who is not a citizen of the United States; and (2) who has not met the qualifications prescribed by law or by ordinance adopted by the governing body of a city or town.
General Qualifications For Municipal Office
Mont. Code Ann. § 7-4-4104, under Municipal Officers in General.
Mont. Code Ann. § 7-4-4104