In Saint-Gilles / Sint-Gillis, 50,267 people live within an area of 2.5 km². The average age is 36, and tenants make up 74% of residents. Average net income per person is €13,438 a year, while households own an average of 0.4 cars. Residents are 52.8% Belgian, 11.3% French, 5.1% Portuguese, 4.5% Italian, 4% Spanish, 3.1% Moroccan, 2.8% Romanian and 16.4% from other countries. Homes in the commune average 4.3 rooms; the national average is 6. The average building dates from around 1903. The stock comprises 43.2% buildings and flat blocks, 43.5% closed-type houses, 12.5% commercial houses, 0.7% other buildings and 0.1% semi-closed houses.
There are 71 flats for sale, with a current average price of €362,031. The listed prices range from €60,000 to €795,000. The wider market also includes 42 houses for sale, averaging €797,071, and 110 flats for rent. For everyday travel by road, the N261 and N266 run through Saint-Gilles / Sint-Gillis. The R0 entrance is 7 minutes by car from the town centre, and the A4 / E411–E25 entrance, on the Brussels–Namur–Arlon route, is 11 minutes away by car.
Metro lines 2 and 6 serve the commune, connecting Simonis and Roi Baudouin respectively with Elisabeth. There are 7 tram lines with stops in Saint-Gilles / Sint-Gillis; listed services include lines 3, 4, 51, 81 and 92. The 25 bus lines include STIB routes 48, 49 and 50, De Lijn route 136 and TEC route W. Stations close to the centre include Bruxelles-Midi, Bruxelles-Chapelle, Bruxelles-Central, Germoir and Bruxelles-Luxembourg. Brussels Airport can be reached in 55 minutes by public transport or 14 minutes by car.
Families have access to 28 nurseries, 14 nursery schools, 16 primary schools and 6 secondary schools. Examples are Dream Land nursery, Ecole Nouvelle, Ecole Fondamentale Annexée Victor Horta - Saint-Gilles and Lycée Intégral Roger Lallemand. Supermarket options listed for the commune are 7 Carrefour, 6 Delhaize, 2 Louis Delhaize, 1 OKay and 1 Match / Smatch. Shared mobility includes 12 Villo! bicycle stations and 14 Cambio stations; there are also 4 electric-vehicle charging stations.