Aarschot is a city and municipality in the province of Flemish Brabant, in Flanders, Belgium. The municipality comprises the city of Aarschot proper and the towns of Gelrode, Langdorp and Rillaar. On January 1, 2006, Aarschot had a total population of 27,864. The total area is 62.52 km² which gives a population density of 446 inhabitants per km².