Sulejówek is a town in Poland, about 18 km east of Warsaw city centre and part of its metropolitan area. It is located in Masovian Voivodeship, in Mińsk County. Its population numbers 19323. The town is well known in Poland as the place where Józef Piłsudski lived in the years between 1923 and 1926. The former manor houses a museum dedicated to him and is listed as a Historic Monument of Poland.