Silly, Belgium
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For alternate meanings, see Silly.
Silly in French or Opzullik in Dutch is a municipality located in the Belgian province of Hainaut. On January 1st, 2004 Silly had a total population of 7,808 (3,881 males and 3,927 females). The total area is 67.68 km² which gives a population density of 115.36 inhabitants per km².