As of early 2026, Monaco remains the most overcrowded country in Europe (and the world) by a massive margin, with a population density exceeding 26,000 people per square kilometer. If we exclude microstates, the Netherlands holds the title for the most densely populated large nation in Europe, with over 530 people per square kilometer, followed closely by Belgium and the United Kingdom. In these countries, "overcrowding" is a structural reality that manifests as high housing costs, strained transport networks, and intense urban development. For 2026 travelers, this means that popular cities like Amsterdam or London often require booking accommodation and attractions months in advance. By contrast, if you are looking to escape the crowds, the Nordic countries like Norway and Finland remain the least densely populated, offering vast stretches of wilderness where you can go miles without seeing another person.