became the District of Baden, firstly in the Canton of Baden and then in the Canton of Aargau (from 1803). Upon the merging of the canton of Baden into Aargau in 1803, the district gained the municipalities of Würenlingen, Bellikon, Künten, Remetschwil, Stetten, Mellingen, Wohlenschwil and Mägenwil (from neighbouring districts of the canton of Baden) but had to give up Hüttikon, Oetwil an der Limmat, Dietikon and Schlieren to the Canton of Zurich. After World War II, this formerly agrarian region saw striking growth and became the district with the largest and densest population in the Canton (110,000 in 1990, 715 persons per km2). References Baden Former condominiums of Switzerland States and territories established in 1415 Aargau Former vassal states 15th-century establishments in the Old Swiss Confederacy 1410s establishments in the Holy Roman Empire 1415 establishments in Europe 18th-century disestablishments in the Old Swiss Confederacy 1798 disestablishments in the Holy Roman Empire