Willebroek is a municipality located in the Belgian province of Antwerp. The municipality comprises the towns of Blaasveld, Heindonk, Tisselt and Willebroek proper. On January 1st, 2004 Willebroek had a total population of 22,838 (11,165 males and 11,673 females). The total area is 27.41 km² which gives a population density of 833.34 inhabitants per km².