Lierneux covers 92.3 km² and has 3,614 inhabitants. Residents have an average age of 41, and 71% own their home. Average net income is €17,177 per person per year. The population is 50.4% men. By nationality, the figures are 96.8% Belgian, 0.8% French, 0.6% Dutch, 0.4% Italian, 0.3% Portuguese, 0.2% Burundian, 0.2% Romanian and 0.9% other. Homes average 6.4 rooms, and the average building dates to around 1938. Houses make up 95.4% of the housing stock and apartment buildings 4.6%. Building types are 61.5% open houses, farms and castles, 18.8% semi-detached houses, 10% other types, 4.1% buildings and apartment blocks, 3.5% terraced houses and 2.1% commercial houses.
The rental market currently has 1 flat, at €500 per month. The highest and lowest listed monthly rent for a flat are both €500. The N645, N651 and N822 provide road connections in Lierneux. From the centre, the A26 / E25 access towards Liège, Bastogne and Neufchâteau takes 7 minutes to reach. For the A27 / E42 in the direction of Battice, Verviers, Malmedy, Sankt-Vith and Bitburg, the journey is 27 minutes. TEC buses serve Lierneux on 8 lines; the listed routes include 11e, 14/3, 14, 242 and 265. Nearby stations to the town centre are Vielsalm, Trois-Ponts, Coo, Gouvy and Gouvy-Frontiere.
The municipality has 1 Carrefour and 1 Delhaize. Childcare and education provision includes 2 nurseries, 5 nursery schools and 5 primary schools. Nadia Bredo and Les P'Tits Loups are named nursery examples; schools include Ecole Fondamentale Autonome De Lierneux, Ecole Fondamentale Libre and Ecole Fondamentale Communale. There is no secondary school in the commune. The local economy includes 36 mixed farming companies, 15 landscape service firms and 13 logging businesses. Residential and non-residential building construction, joinery installation, and motor vehicle maintenance and repair each have 12 companies.
Lierneux has no shared bicycle service or shared cars, and there is no known EV charging station in the municipality. Liège Airport is 44 minutes away by car, with a public transport journey of 116 minutes. These are the local transport options and services around the flat currently available to rent.