The purpose of this article is to make it easier and more convenient for readers to compare different treatment methods on the ranking of cities / metropolitan areas / urban areas / agglomerations / conurbations / megalopoleis by population. Very often different rankings give different figures, as the limits and extends of the agglomerations are not clearly identified.
*List of cities by population *Largest European metropolitan areas by population *Largest urban areas of the European Union by population *Largest cities of the European Union by population *List of major cities in Brazil *List of megalopoleis *List of metropolitan areas by population * *Metropolitan areas in France *List of United States cities by population *List of United States urban areas by population *List of cities in Canada *Largest cities throughout history