This paper analyzes the urbanization of Ecuador in the period 1950 – 2010 under the Functional Urban Areas (FUAs) definition. When Ecuadorian FUAs population evolution over time is explored, it is possible to observe that the urbanization of Ecuador had its peak between 1960 and 1980. Moreover, the highest increase of population in recent decades is mostly driven by the urban growth of small FUAs. In addition, the analysis suggests that the FUAs in Ecuador are in line with the size and structure of the FUAs of a similar developing country, Colombia, and the whole OECD sample of FUAs. Finally, it is pointed that the population of Ecuador is concentrated in the FUAs of metropolitan size (1.5 million of inhabitants or more), which are below the average of the metropolitan areas of the OECD