Illkirch-Graffenstaden (French pronunciation: [ilkiʁʃ ɡʁafɛnʃtadɛn]) is a commune in the Bas-Rhin department in Alsace in north-eastern France. It is the second-largest suburb of the city of Strasbourg, and is adjacent to it on the south-southwest. Illkirch-Graffenstaden is one of the fastest growing cities in France and probably in Europe, its population having more than doubled in less than forty years (from 11,648 in 1968 to 26,368 in 2006).