Kortenberg has 20,279 inhabitants spread across 34.7 km². The average age is 41, and 75% of residents own their homes. Average annual net income per person is €23,025, while households have an average of 1.4 cars. The population is 89.1% Belgian, 1.3% Polish, 1.2% Dutch, 1.1% Romanian, 0.7% British, 0.7% Italian, 0.6% German and 5.3% other nationalities.
Apartments form part of a housing stock made up of 21% apartment buildings and 79% houses. Dwellings have an average of 6 rooms, and the average construction year of buildings is 1964. The building-type breakdown is 20.2% buildings and apartment blocks, 39.6% open-type houses, farms and castles, 24.6% semi-detached houses, 11.8% closed-type houses, 2.2% other buildings and 1.5% commercial houses. There are 0 apartments for rent in Kortenberg. The stated monthly rent is €0, and the highest and lowest monthly rental figures are also €0.
The N2 passes through the municipality. By car, the centre is 4 minutes from the R0 entrance and 4 minutes from access to the A3 / E25–E40–E42 route serving Brussels, Leuven, Liège and Eupen, with a continuation towards Aachen. Kortenberg has 14 bus lines, including De Lijn services 351, 352, 358, 651 and 652. Nearby stations are Kortenberg, Nossegem, Erps-Kwerps, Brussels Airport–Zaventem and Zaventem. No metro or tram routes are listed.
The municipality has 6 nurseries, including Paddehuisje and ’T Kapoentje, as well as 6 nursery schools and 6 primary schools. Gemeentelijke Basisschool – De Boemerang, De Negensprong and De Regenboog are among the schools named. There is no secondary school. Shopping options include 2 Delhaize supermarkets, 1 Louis Delhaize and 1 Carrefour. An EV charging station is available, but there are no shared bicycles or shared cars in Kortenberg. Brussels Airport is 9 minutes away by car and 40 minutes by public transport.