1940 Population- 101,065
Duluth found herself once again booming by 1940. The population was at levels comparable to pre-depression numbers, and the tonnages of iron passed through the docks were at their highest. U.S. Steel Works was reopened after years of closure and working at full capacity.
World War II
16,000 Duluthians served during the war, and some 600 were causalities.
Like the first World War, WWII had positive economic impacts on Duluth. Many defense contracts were written for Duluth. The biggest industry was the construction of ships. Shipbuilding in the Twin Ports would pump money into the city and pockets of business men.