The authors extend research on the relationship between religious factors & aggregate suicide rates by focusing on religious homigeneity, using 1980 data on 296 standard metropolitan statistical areas. As hypothesized, religious homogeneity was inversely associated with suicide rates, & its estimate effects were greater than those of other religious variables that are widely used in studies of suicide. The researchers also found regional differences in the apparent influence of religous homogeneity. (72 refs)