Grimbergen is a municipality in the province of Flemish Brabant, in Flanders, one of the three regions of Belgium. The municipality comprises the towns of Beigem, Grimbergen, Humbeek and Strombeek-Bever. On January 1, 2006 Grimbergen had a total population of 33,965. The total area is 38.61 km² which gives a population density of 880 inhabitants per km². Grimbergen is located in the Dutch language area of Belgium. The French speaking minority is represented by 4 members on the 30-seat local council. Grimbergen is mostly known for its Norbertine abbey and the beer first brewed there.