The municipality comprises the towns of Oudenaken, Ruisbroek, Sint-Laureins-Berchem, Sint-Pieters-Leeuw proper and Vlezenbeek.

The oldest document dates back to the 9th century and is a deed of donation by 'dame Angela', a noblewoman from Brabant, in which reference is made to a 'domain' of seven miles in length and one mile in width with a parent church and 9 subsidiary churches', donated to the chapter of Saint Peter in Deutz, Cologne.

In 1284 Henry I, Duke of Brabant and lord of Gaasbeek, granted a copy of the local penal code to the populace, which led the municipality to long remain the principal seat of a 'meierij' (Dutch for a district over which a mayor has jurisdiction) and a college of Aldermen.

By marriage or inheritance both the water castle of Coloma, currently the Municipal Cultural Centre, and the rights of the fiefdom as well as all manner of provisions (among others mills) became the possession of important nobles and courtiers such as Jan Karel Roose, member of the Great Council of Mechelen and Vital-Alex de Coloma, chamberlain of empress Maria-Theresia.

Since 1 January 1977 the former municipalities of Sint-Pieters-Leeuw, Oudenaken, Ruisbroek, Sint-Laureins-Berchem and Vlezenbeek have been joined to form a new administrative residential community.