Olne is a municipality of Wallonia located in the province of Liège, Belgium. On January 1, 2006, Olne had a total population of 3,793. T…Olne is a municipality of Wallonia located in the province of Liège, Belgium. On January 1, 2006, Olne had a total population of 3,793. The total area is 15.99 km² which gives a population density of 237 inhabitants per km².
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