International audienceThis article aims to observe the social division of Mexico-City space at the lowest available level, the block. Such an analysis, conducted from census data and empirical work seeks to question the dynamic through colonias populares in the outskirts of the city, so often read in terms of urban fragmentation and / or in terms of systematic consolidation. The construction of a typology according poverty indicators highlights the heterogeneity of socio-spatial forms of division. New contextual dimensions emerge and differentiate these neighborhoods, highlighting a plurality of maturation trajectories.Cet article vise à observer la division sociale de l'espace de Mexico au niveau le plus fin disponible, celui de l'îlot. Un...