One of the most serious problems which developing countries are facing is that of population explosion in urban centres. The problem lies in that urban growth in these countries is at a rate of greater than that of economic development. In other words, transformation of economic activity is lagging behind the pace of reshaping the population of a nation from rural to urban, which results in over-urbanization problems in large cities. Besides, since the rate of urban growth is much faster than that of developed countries, it is unlikely that experiences of industrialized countries can be applied without better understanding of the different nature and characteristics of the problems. The purpose of this paper is to examine and develop Helbock's studies on the following points: (1) different natures of urban growth among the largest cities, (2) the contribution of migration of non-refugees as well as refugees to the urban growth, and (3) the origin of migrants. In addition, a tentative discussion on Lyallpur survey data is attempted