Avelgem has 10,158 residents across 22.1 km², with an average age of 42. Women represent 50.7% of the population. The home-ownership rate is 74%, average net income is €18,356 per person annually, and the average household has 1.2 cars. Nationalities are recorded as 96.7% Belgian, 0.4% Polish, 0.4% French, 0.3% Dutch, 0.3% Romanian, 0.2% Slovak, 0.2% Afghan and 1.4% other.
Apartments form part of a housing stock in which 13.6% of dwellings are in apartment buildings; houses make up the remaining 86.4%. Across the commune, homes average 5.8 rooms and the buildings date from around 1957 on average. The building-type breakdown is 30.5% semi-detached houses, 30% detached houses, farms or castles, 22.7% terraced houses, 13.1% apartment buildings and blocks of flats, 3.3% commercial houses and 0.4% other types. There are currently 28 flats for sale. The stated average price is €218,216, with the lowest listed price at €139,000 and the highest at €344,400.
Road connections include the N8, N8e, N36, N353 and N391a. A14/E17 access, serving routes towards Antwerpen, Sint-Niklaas, Gent, Kortrijk and Lille, is a 14-minute drive from the centre. The A17/E403 towards Brugge, Kortrijk and Tournai can be reached in 16 minutes by car. Avelgem has 9 bus lines; examples are De Lijn 65, 85, 91 and 99, and TEC 97 between Tournai and Ronse. The listed stations are Anzegem, Vichte, Ronse/Renaix, Harelbeke and Waregem.
There are 6 nurseries and 6 nursery schools, as well as 4 primary schools and 6 secondary schools. Among the named establishments are Zonnetje Avelgem (De Toekomst), Biebelebontseberg, Vrije Basisschool Sint-Jan Berchmans Avelgem, Vrije Kleuterschool and Sint-Paulusschool Campus Sint-Jan Berchmans 1 and 2. For groceries, the commune has 1 SPAR, 1 Aldi, 1 Carrefour and 1 Colruyt. No shared-bike or shared-car service is present, and there is no known EV charging station. Wevelgem Airport is 22 minutes away by car; public transport takes 62 minutes.