Denderleeuw has 20,338 inhabitants across 13.9 km². The average age is about 40, and women account for 50.9% of the population. Residents are mostly owners, at 74%, and average net income is €19,054 per person per year. Nationalities are 91.9% Belgian, 1.5% Dutch, 1.1% Congolese, 0.7% Romanian, 0.6% Cameroonian, 0.5% Polish, 0.4% Turkish and 3.4% other. Households own an average of 1.2 cars.
Houses make up 77.7% of the municipality’s dwellings, while apartment buildings account for 22.3%. Across the housing stock, the average home has 5.6 rooms and buildings date on average from 1963. Building types are 32.9% closed houses, 31.4% semi-closed houses, 21.6% buildings and flat blocks, 10.9% open houses, farms and castles, 2.4% commercial houses and 0.8% other types. There are 24 houses for sale. The average asking price is €396,400, with listings ranging from €199,000 to €849,000.
The N208 and N405 are among the roads serving Denderleeuw. By car, the A10/E40 entrance towards Brussels, Aalst, Ghent, Bruges and Ostend is 6 minutes from the town centre; access to the R0 Brussels ring takes 12 minutes. Bus services listed for the municipality include De Lijn lines 31, 32, 33 and 330, as well as the NMBS/SNCB BUS line. Stations in the area include Iddergem, Denderleeuw, Liedekerke, Welle and Okegem. No metro or tram service is listed. Brussels Airport is 24 minutes away by car or 93 minutes by public transport.
For families, Denderleeuw has 6 nurseries, 8 nursery schools, 8 primary schools and 4 secondary schools. Named examples include De Bengeltjes, Partena Kinderdagverblijven - Doedeldorp, Vrije Basisschool - 'T Landuiterke, Go! Basisschool De Wereldboom, Vrije Basisschool Kcd, Leonardo College and Go! Atheneum Denderleeuw. Supermarkets include 2 Aldi stores, 2 Delhaize stores, 1 Louis Delhaize, 1 OKay, 1 SPAR and 1 Carrefour. There are no shared bicycles, shared cars or known EV charging stations in the municipality.