La Hulpe is a Walloon municipality located in the Belgian province of Walloon Brabant, 20 km south-east of the centre of Brussels, but only about 3 km from the edge of the Brussels-Capital Region. On January 1, 2007, La Hulpe had a total population of 7,309. The total area is 15.60 km², including 3 km² of the Sonian Forest; this gives a population density of 463 inhabitants per km².
La Hulpe still keeps two hamlets, Gaillemarde in the west and Malaise-Bakenbos in the east. The limits of the latter hamlet and of other parts of La Hulpe were modified when the linguistic border (between French and Dutch) was fixed in 1963.