A common claim in the literature is that higher-educated persons are more likely to marry outside their ethnic/racial group than lower-educated persons. We re-examine this "educational gradient" with a multilevel analysis of 46 immigrant groups in the Current Population Survey. We find that there are positive effects not only of individual education on intermarriage but also of the educational level of a group. Moreover, the educational gradient declines when the aggregate level of education of an immigrant group is higher. The aggregate effect of education points to cultural explanations of the gradient that emphasize the role of interethnic attitudes. The interaction effect points to a structural explanation that explains the gradient in terms of opportunities of finding similarly educated spouses within the group.