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James McMillan (politician) (1838–1902), U.S. Senator from Michigan •
James Bryan McMillan (1916–1995), U.S. federal judge •
Jimmy McMillan (born 1946), U.S. fringe politician, founder of Rent Is Too Damn High Party •
James E. McMillan (died 1907), mayor of Victoria, British Columbia •
Jim McMillan (Florida Sheriff) (born 1937), Jacksonville Sheriff ==Other==