Opwijk is a
municipality located in the
Belgian province of
Flemish Brabant. The municipality comprises the towns of
Mazenzele[?] and Opwijk proper. On January 1st, 2000 Opwijk had a total population of 11,718 (5,745 males and 5,973 females). The total area is 19.89
km² which gives a
population density of 589.14 inhabitants per km².