This study provides further evidence for the prinicple that ecological areas characterized by rapid change & social economic disparities experience above average rates of suicide. Data for the 24 Census Metropolitan Area (CMAs) in Canada are examined. A number of hypotheses drawn from the ecological literature are developed & evaluated with the use of multiple regression methods. The findings show that 3 variables explain most the variance in the male suicide rate across CMAs, namely: household size, population change, & proportion of Aboriginals. (43 refs)