​ALLENSTEIN, a garrison town of Germany, in the province of East Prussia, on the river Alle, 100 m. by rail N.E. from Thorn, and 30 m. from the Russian frontier. Pop. (1900) 24,295. It has a medieval castle, several churches, a synagogue and various industries—iron-foundries, saw-mills, brick-works, and breweries; also an extensive trade in cereals and timber.