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An evaluation of the spatial distribution of job accessibility in S o Paulo was conducted through the correlation of work trips demand and socioeconomic data of public transport users. It was proposed a gravitational job inaccessibility index (GJI) that identifies higher volumes of home based work trips with longer durations. Therefore, a characterization of the daily home based work displacements of low income population was obtained. The results show that, in general, half of the public transport users spend at least 2h30min daily in commutes. Finally, the GJI spatialization reveals the gravity force of production and attraction of work trips for the low income population, as well as the city segregation.