The current apartment-rental choice in Erquelinnes is 1 flat, listed at €850 per month. The stated rent range is €850 to €850, and the average monthly price is also €850. Erquelinnes has 10,003 residents across 44.5 km². Residents have an average age of about 40; 69% own their homes, and average net income per person is €15,160 a year. Women represent 51.3% of the population. The nationality breakdown is 92.9% Belgian, 4.9% French, 0.8% Italian, 0.1% Moroccan, 0.1% Lebanese, 0.1% Romanian, 0.1% Pakistani and 0.9% other. Apartment buildings account for 3% of dwellings, while houses make up 97%. Dwellings average 6 rooms, and buildings date from around 1912 on average. The wider stock consists of 33% semi-closed houses, 29.3% closed houses, 27.8% open houses, farms and castles, 3.9% commercial houses, 3.2% other buildings and 2.7% buildings and flat blocks.
The N40, N54a, N55 and D336 serve Erquelinnes. By car, the A7 / E19–E42 entrance is 24 minutes from the town centre, and the A15 / E42 entrance is 27 minutes away. Public transport includes TEC bus 108 between Binche and Erquelinnes, TEC 129 between Macquenoise and Mons, TEC 134/ between Mons and Beaumont, and express line E110 between Beaumont and Mons. The NMBS/SNCB Tournai–Mouscron bus line is also listed. Nearby stations are Erquelinnes-Village, Erquelinnes, Erquelinnes-Frontière, Solre-Sur-Sambre and Labuissière.
There are 6 nurseries, 11 nursery schools, 11 primary schools and 2 secondary schools in the municipality. Ecole Fondamentale Libre Notre-Dame and Ecole Fondamentale Communale are named among the nursery and primary schools; the secondary schools include Ecole D'Arts Et Metiers and Institut Technique De La Communaute Francaise Erquelinnes. For shopping, local options include 1 Trafic, 1 Colruyt and 1 Delhaize. Erquelinnes has no shared-bike service or shared cars, and no known EV charging station. Brussels South Charleroi Airport is 52 minutes away by public transport or 33 minutes by car. Across the municipality, houses make up 97% of dwellings and apartment buildings 3%.