Tienen or
Thienen (; ) is a
city and
municipality in the province of
Flemish Brabant, in
Flanders,
Belgium. The municipality comprises the city of Tienen proper and the towns of Bost,
Goetsenhoven,
Hakendover,
Kumtich,
Oorbeek,
Oplinter,
Sint-Margriete-Houtem and
Vissenaken. On January 1, 2006, Tienen had a total population of 31,835. The total area is which gives a
population density of 444 inhabitants per km².