According to Duluth Sister Cities International, Duluth has five official Sister Cities:
1980: Thunder Bay, Ontario, Canada. Many residents of Duluth know that Thunder Bay is less than a day’s drive away. It is located up the North Shore of Lake Superior, just across the border in Ontario, Canada.
1987: Växjö, Sweden
1987: Petrozavodsk, Russia
1989: Ohara, Japan
2014: Rania, Iraq
History of Duluth Minnesota 