The purpose of this paper is to test the differential urbanisation theory for the Turkish case during the 42 years between 1955-97. The theory is first tested for the country as a whole, and subsequently for each of its three major regions with differing development levels. The findings for Turkey, in general, are consistent with the theory of differential urbanisation. The country and all its regions are found to be at the 'early medium city' stage (i.e. the first phase of polarisation reversal). The timing of the stages in three regions was consistent with their respective level of development. The special characteristics of the Turkish case and their effects are discussed.