Access to the workplace is one of the most important rights of citizenship. In some areas, the unavailability of job opportunities pushes people to commute. Nevertheless, there are areas where even commuting does not allow the improvement of individuals’ economic and social conditions. This locks residents into a local job market that can be, in many cases, limited, low-income, or just unsatisfying. In this paper, we focus on the latest conditions in the Lombardia region (Italy). In order to identify marginal areas where low transport accessibility and high commuting cost may represent a barrier to territorial disparities in job access, we compare different classifications of marginality: socioeconomic indicators, an institutional one (SNAI), and, finally, one based on an indicator of marginal commuting gain (MCG). Evidence from this work will show an almost perfect match between very-fragile territories in socioeconomic terms and areas characterized by a low MCG indicator.