This paper quantifies the relative importance of determinants of individual-level immigration preferences. We develop and estimate a new latent-factor model using survey data on eighteen countries from the European Social Survey from 2014 and 2015. Identifying individual-level economic concerns about immigration, worries about compositional amenities, racism, and altruism as drivers of immigration-related policy preferences, we show that racism is quantitatively the most important factor. It is about as important as the joint effect of worries about the economic and non-economic effects of immigration. Furthermore, we document that altruism raises significantly the support for immigration, although it is quantitatively less important than the other factors. The distribution of preferences for immigration in the European population is highly multimodal with significant differences across high- and low-educated individuals. We conclude with a discussion of how those differences arise and how they might be altered.