Messancy is home to 8,218 residents over 52.6 km². The average age is 40, women account for 50.4% of the population, and 78% of residents own their dwelling. Average net income per person is €21,985 a year. Nationalities represented include 84.5% Belgian, 5.1% French, 2.7% Luxembourgish, 2.4% Portuguese, 1.6% Italian, 1.4% Romanian, 0.2% Spanish and 2% other. Homes in the municipality average 6.2 rooms, compared with the national average of 6; the average building year is 1947. Houses account for 86.8% of dwellings, while apartment buildings make up 13.2%. The building stock is 48.7% open-type houses, farms or castles, 24.4% semi-detached houses, 12.9% buildings and flat blocks, 11.9% closed-type houses, 1.1% other buildings and 1% commercial houses.
There are currently 0 houses for rent. The listed average monthly rent is €0, with the highest and lowest listed monthly prices both €0. Messancy’s businesses include 27 in mixed farming, 23 in restaurants and mobile food service, 19 in hairdressing and other beauty treatment, 10 in residential and non-residential building construction, 9 in specialist clothing retail and 7 in roofing. The N870 and N883 pass through the municipality. The centre is a 5-minute drive from the A28/E411 towards Aubange, Athus and Longwy, and also 5 minutes from the A4/E411–E25 towards Brussels, Namur, Arlon and Luxembourg City.
There are 16 bus lines serving Messancy. Among them are TEC 16, running Virton–Athus–Arlon; TEC 20, Dinant–Florennes; TEC 21, Namur–Maredsous; TEC 211, Battincourt–Athus–Differt–Stockem; and TEC 80/1, Arlon–Luxembourg. The stations closest to the centre are Messancy, Athus/Athem, Aubange, Athus-Frontiere and Aubange-Frontiere-Luxembourg. Childcare and education include 4 nurseries, with Lac'Aline and Petits À Petons among them, 11 nursery schools, 10 primary schools and 3 secondary schools. Named schools include Ecole Communale Fondamentale Messancy-Wolkrange, Ecole Fondamentale Autonome De Messancy, Institut Cardijn Lorraine - Enseignement General and Institut Cardijn Lorraine - Enseignement Technique Et Professionnel.
For everyday shopping, there is 1 Cora and 1 Louis Delhaize. No shared bicycles or shared cars are available in Messancy, and no EV charging station is known in the municipality. Liège Airport is 93 minutes away by car, or 207 minutes by public transport. The municipality’s housing stock is predominantly houses, but the current rental listings show 0 houses available to rent.