Located in the north-western part of the region, it is bordered by the City of Brussels, Ganshoren, Koekelberg, and Molenbeek-Saint-Jean, as well as the Flemish municipalities of Asse and Wemmel.

[2] Neolithic tools and remains of a Gallo-Roman villa have been found on the territory of Jette, proving the old age of the first settlements in this area.

In the 13th century, the Abbey possessed half of the municipality's territory and played an important social and economic role until the French Revolution.

In the 17th century, during the period of the Spanish Netherlands, the Finance Minister under Archdukes Albert and Isabella acquired and refurbished the old 12th-century Rivieren Castle in the village of Ganshoren, near Jette.

In 1654, the minister's son made this estate into a barony, then five years later, into a county, which included Jette and several neighbouring villages.