Of course, Barks never pinpointed where Duckburg was situated but he did tell us that the town was in the state of Calisota (a contraction of California and Minnesota). Based on 'hints' from his stories, Don Rosa and the Italian Donaldists think that they have sufficient material to pinpoint Duckburg on a map.

NB.: This is not an official declaration of Duckburg's location!

(For further 'information' see HERE.)