Definition city. What is a town in Germany as city refers to a large, gated, human settlement. The exact definition of the city is not so easy. Points of contention are the population density, the density, the infrastructure and the economic structure and the Organization of life together. All settlements of people who today are known as city, are classified according to the number of their inhabitants. In Germany following classification shall apply: 2,000 to 5,000 inhabitants: town of 5,000 to 20,000 inhabitants: town of 20,000 to 100,000 inhabitants: town of 100,000 to 1,000,000 inhabitants: city through-1.000.0000 inhabitants: metropolis international apply other divisions. In Austria a town must at least 5,000 inhabitants have, in the 10,000 Switzerland and Japan even 50,000. For cities, there are still other names such as metropolis, megacity, Megapolis. In total, there are approximately 300 cities. In Germany, there are three cities (Berlin, Hamburg, Munich) and 82 towns more than 100,000 inhabitants.