Research Bulletin 42, March 2008, 12 pages. Immigrants to Canada are increasingly concentrated in Canada’s three biggest metropolitan areas. Toronto, Montreal and Vancouver accommodate 70% of those who arrived between 2001 and 2006. The three biggest gateway cities, however, exhibit important differences in the ethnic groups they attract, and the patterns of settlement. Toronto and Vancouver have some similarities (more Asians, more immigrants settling in the suburbs), while Montreal has a larger proportion of European and African immigrants, who still tend to cluster in the central city. The suburbanization of immigration in Toronto and Vancouver poses challenges for service provision and planning and raises questions about the pros and cons of suburban ethnic enclaves in enhancing immigrant integration.