Objectives. Our objective is to contribute to the literature regarding the association between immigrant children's health, their ethnicity and their living in neighbourhoods with a high ethnic concentration of one's own ethnicity. Using data from families from five ethnic groups who all immigrated to Vancouver metropolitan region in Canada, our research question asks: How ethnicity, ethnic concentration and living in a neighbourhood with others of the same ethnic background contribute to the health of immigrant children?Design. Two data sets are integrated in our study. The first is the New Canadian Children and Youth Study, which collected original data from five ethnic groups who immigrated to metropolitan Vancouver. The second data set, from which we derived neighbourhood data, is the Canadian census. The dependent variable is health status as reported by the parent. Independent variables are at both the individual and neighbourhood levels, including ethnicity, sex and the percentage of people living in the neighbourhood of the same ethnic background. Analysis was completed using hierarchical linear modelling.Results. Children (n=759) from 24 neighbourhoods were included in the analyses. Health status varied by ethnicity and ethnic concentration, indicating the heterogeneity of immigrant populations.Conclusion. With the lack of research on the health of immigrant children and youth living in ethnic concentrations, our findings make an important contribution to understanding the influences on the well-being of immigrant populations.