The results of research designed to measure black residential segregation outside the central cities (i.e., the suburbs) of ten areas of Michigan are reported. The census data suggest that while substantial migration of blacks into the suburbs occurred in several areas of Michigan during the 1960's, the suburban black population numbers remained proportionally small. Only in suburban Ann Arbor was the black proportion greater than four percent. The evidence suggests that, regardless of the small size of the black population, suburban Michigan is characterized by a high degree of black residential segregation in all but one area under examination. From 1960 to 1970, six of the areas experienced an increase in segregation. Among the reasons for the increase are central city function and differential black-white suburban migration. For example, four of the five suburban areas that increased in segregation from 1960 to 1970 surround manufacturing central cities. This trend may suggest that suburbs tend to follow a pattern of residential segregation similar to that of other central cities. (Author/DE)