The current apartment rental offer in Merbes-Le-Château consists of 1 flat at €600 per month. The listed highest and lowest monthly rents are both €600. The municipality is home to 4,266 people over 30.5 km², with an average age of 40. Home ownership stands at 71%, and average net income is €16,413 per person per year. The population is 95.4% Belgian, 2.1% French, 1.5% Italian, 0.2% Spanish, 0.1% Moroccan, 0.1% Russian, 0.1% Burundian and 0.3% other nationalities.
Apartment buildings account for 2.1% of the local building stock, while houses account for 97.9%. Homes average 6.4 rooms, and buildings were generally built around 1915. The wider mix comprises 39.4% open houses, farms or castles, 35.8% semi-closed houses, 18.7% closed houses, 2.6% other building types, 2.1% apartment buildings and 1.5% commercial houses. These are municipal building figures; the current flat rental offer is 1 property. Households have an average of 1.3 cars.
N55, N559, N561 and N562 are among the roads passing through Merbes-Le-Château. The centre is a 23-minute drive from access to the A15 / E42 and 22 minutes from access to the A7 / E19–E42. Public transport includes TEC bus lines 108, 119, 194 and 21, plus the NMBS/SNCB bus service on the Tournai–Mouscron route. The nearest stations are Solre-Sur-Sambre, Labuissière, Erquelinnes-Village, Fontaine-Valmont and Erquelinnes. Local childcare and school facilities comprise 2 nurseries, 5 nursery schools and 5 primary schools; there is no secondary school. No supermarkets or shops are specified in the local information. There are no shared bicycles or shared cars in the municipality, and no known charging station. Brussels South Charleroi Airport is reachable in 29 minutes by car or 108 minutes by public transport.