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Two theorems deduced from the primitive assumptions and definitions of a macrosociological theory of social structure are tested with data on intermarriage in the 125 largest American metropolitan areas (SMSAs). The data base is the public use sample of the 1970 U.S. Census. The two theoretical predictions are: (1) a group's relative size is inversely related to the proportion of its members who are outmarried; and (2) an SMSA's heterogeneity is directly related to the rate of intermarriage in it. The underlying assumption is that the structural constraints of size distributions affect marriage notwithstanding cultural values promoting ingroup marriages. The data confirm the two predictions (corroborating the underlying assumption) for most size differences and most forms of heterogeneity examined. Thus, heterogeneity in national origins, mother tongue, birth region, industry, and occupation raise intermarriage rates in …