Résumé : This paper investigates the links between the existence of a neighbourhood effect and school choice. The case study is Brussels. It offers the opportunity to analyse a segregated urban context with a school system organized as a quasi-market based on the freedom of school choice. Crossclassified multilevel analyses have been used on 36 427 students in 117 neighbourhoods and 131 schools from the Wallonia-Brussels Federation's Student count. Our results challenge the idea of local embeddedness in deprived areas. This should be understood in the light of the structural characteristics of the school system (the importance of delays and of early orientations in alternative tracks) but also of the spatial patterns of the school offer in Brussels, which varies according to one's geographical place in the school system.