This article proposes an analysis of socio-spatial configurations of various districts in the city of Besançon over the intercensal period from 1990 to 1999. This study is based on a multi-date exploratory statistical analysis trying to clarify the sustainable or unsustainable structures in the urban system. Census data for 1990 and 1999 are used to generate twenty or so indicators which characterize the enumeration districts of Besançon (these statistical areas are known as IRIS in French census). According to a factor analysis, we can observe the trajectories of the IRIS between the two chosen dates, which depend on the considered indicators. This analysis highlights the sociospatial organization of Besançon and demonstrates the contrasts between the well-off neighbourhoods, becoming increasingly affluent, more excluded deprived neighbourhoods and areas in-between undergoing transformation. In general terms, the study of trajectories contributes in showing different socio-spatial trends of the studied districts, in particular the phenomena of gentrification, pauperization or a movement towards greater social mixing.