In Flémalle, 26,304 people live within a municipal area of 36.6 km². The average age is close to 41, and 64% of residents own their homes. Average annual net income is €16,106. The population includes 92.6% Belgians, 3.5% Italians, 0.7% French, 0.4% Spanish, 0.3% Moroccans, 0.3% Romanians, 0.2% Guineans and 2% other nationalities; 51.9% of residents are women. Apartments form a smaller part of the local housing stock than houses, but there are currently 10 flats listed for sale.
Dwellings in the municipality average 5.6 rooms, and the average construction year of buildings is 1937. The overall housing stock consists of 84.9% houses and 15.1% apartment buildings. By building type, 34% are semi-detached houses, 29.6% terraced houses, 19.2% detached houses, farms and castles, 14.8% apartment buildings and blocks of flats, 1.9% commercial houses and 0.5% other types. The average asking price for a flat for sale is €207,500. Current sale listings range from €99,999 to €280,000.
Flémalle is connected by the A15/E42, reached from the centre in 6 minutes by car, and the A602/E25, 10 minutes away. The N617, N639, N644, 644a and N677 are also accessible. Bus services include TEC lines 3, 32, 41, 42 and 47, among 15 lines serving the municipality. Line 3 links Rép. Française, Tilleur, Jemeppe and Flémalle (Trixhes); line 32 runs between Flémalle (Trixhes), Jemeppe, Seraing, Boncelles and CHU; line 41 connects Sart-Tilman, Ougrée, Seraing, Jemeppe and Mons; line 42 serves Flémalle, Profondval and Mons; and line 47 runs from Jemeppe through Ivoz and Flémalle to Stockay. Stations near the centre are Leman, Flemalle-Haute, Flemalle-Grande, Jemeppe-Sur-Meuse and Seraing.
The commune has 20 nurseries, 23 nursery schools and 24 primary schools, along with the secondary school Athenee Provincial De Flemalle Guy Lang. Examples include nursery Guimauve Et Barbapapa, Ecole Fondamentale Communale Ivoz-Ramet II and Ecole Fondamentale Libre Saint-Jean-Baptiste. Everyday shopping options include 2 Carrefour stores, 1 SPAR, 1 Aldi and 1 LIDL. There is 1 electric-vehicle charging station, and the commune has no shared bicycles or shared cars. Liège Airport can be reached in 8 minutes by car or 33 minutes by public transport.