Estimates of the number of Brussels residents have been grossly underestimated. Latest figures released by the national registry, whose figures are updated every two months, show that there are currently 1.12 million residents living within the 161 square kilometers of the city.

Strongest rises in population are in the centre, west and north of the city. The National Institute of Statistics had previously predicted that the Brussels population would eventually reach 1.2 million in 2020. Accurate figures are crucial for calculating public services, including schools, doctors and hospital services.