The issue of immigrant spatial concentration and the possibilities for immigrant dispersion through migration features in at least three interrelated debates about immigration. First, the ethnic enclave literature centers on the question of whether spatial concentration improves or harms the economic well-being of immigrants. Second, spatial assimilation theory links immigrant relocation away from residential enclaves to socioeconomic gains. Although framed at an intra-urban scale, we suggest that similar assimilation logics infuse thinking and expectations about immigrant settlement and spatial mobility at other scales. And third, immigrant clustering links to anxieties about the threats posed by non-European origin newcomers to the traditional cultural fabric of the nation. In the current wave of immigration, research on questions of settlement geography and spatial mobility has so far been restricted to the first generation. But as the current wave of immigration matures there is a growing population of adults who are the children of immigrants. This paper investigates the migration behavior of these adult children, specifically the 1.5 generation, seeking to answer the question of whether they will remain in the states in which their parent’s generation settled or move on. It also assesses whether the out-migration response of the 1.5 generation in states of immigrant concentration is similar to that of their parent’s generation or the US-born population.