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The border province of Posen-West Prussia (German: Grenzmark Posen-Westpreußen) was a province of the Free State of Prussia. The capital was Schneidemühl (Piła). The province had an area of 7,695 km², and was located within present-day Poland. Posen-West Prussia was created in 1922 out of those parts of the provinces of Posen and the western parts of West Prussia that remained with the Weimar Republic after the end of World War I; the largest parts of these provinces had become parts of the Polish Republic according to the Treaty of Versailles. Posen-West Prussia was dissolved in 1938, when its territory was divided between the provinces of Silesia, Pomerania, and Brandenburg.
Population
- 1919: 326,900
- 1925: 332,400
- 1933: 470,600
Territories and Provinces of 
