International audienceThis article studies the social divisions of Mexico-City’s space at the smallest available level, the city block. Such an analysis, based on census data and empirical work, questions the dynamics that undercut the colonias populares in the city’s outskirts, which are often considered in terms of urban fragmentation and/or systematic consolidation. Constructing a typology with 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. Une telle analyse, m...