A little while later, on October 4, 1334, the town of Garnsee was founded in the immediate vicinity of the village by Bertold von Riesenburg, Bishop of Pomesania; it was called Garzanum in the document of foundation.
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Until 1919 Garnsee had belonged to Kreis Marienwerder in the administrative district of Regierungsbezirk Marienwerder in the province of West Prussia, from 1919 to 1939 in Regierungsbezirk Westpreußen of the province of East Prussia and from October 26, 1939, to 1945 in Regierungsbezirk Marienwerder of the province of Reichsgau Danzig-West Prussia.
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After World War I and the Treaty of Versailles a referendum was held allowing the inhabitants to decide on the future national membership of their town.