Urbanization is historical process on worldwide basis. Urbanization leads to creating and developing world cities. With development of cities comes to metropolization. Metropolization is process of increased accumulation of suburbs around the cities. The formation of the metropolis entails the question of management the city itself, but also its suburban areas. How metropolizatoon is important for cities is evidenced by the fact that this process of cities lead to enviable levels of the organization and work on the extended areas. The aim is to get acquainted with the process of metropolization and understand how it is important in the functioning of a big city. Although Croatia does not have a large number of capitals, such as the center of Zagreb, and other cities, are very important areas wich soon awaits enhanced metropolization, because all smaller centers are focused on these cities. Metropolization is required for Croatia, in order to develop the economy and to suburban areas started, with the support of the big cities, independently develop their economy, and thus raise the economy of the whole country to a higher level, which is much needed..