Westerlo is a
municipality located in the
Belgian province of
Antwerp. The municipality comprises the towns of
Oevel[?],
Tongerlo[?], Westerlo proper and
Zoerle-Parwijs[?]. On January 1st, 2000 Westerlo had a total population of 21,960 (11,068 males and 10,892 females). The total area is 55.70
km² which gives a
population density of 394.25 inhabitants per km².