Aim: To compare distributions of volumes of different glomeruli within individuals, by ethnic group. Background: We have described volume heterogeneity of volumes of glomeruli within individuals (IgVs). And proposed that greater volume heterogeneity and net glomerular enlargement mark glomerular stress. Here we compare IgVs of US whites, US Blacks, Senegalese from West Africa and Australian Aborigines. Methods: We measured the volume of multiple glomeruli without sclerosis in the right kidney of adult males undergoing autopsy for sudden or unexpected death. They had no gross renal abnormalities, and no documented renal disease. Thirty glomeruli, 10 from the outer, middle and inner cortical zones, were measured by the Cavalieri method. Subjects were mostly matched within 5 years, but occasionally within