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This paper aims to study the hierarchy of urban centers in the Wilaya of Constantine. The question of this research is how the urban residents are distributed and aggregated across different-sized cities in the period from 1966 to 2020. This question can be addressed by studying urban system or Zipf's law and focus on whether cities are evenly ranked by size. We have found that the urban system of the Wilaya of Constantine has a known and remarkable mutation over the last 54 years. Before 1987doi:10.20431/2456-4931.071210 fatcat:3xcglukkvzaaddvqzjar6fh2mm