This article reports data from several population sets developed by Lester for studies of homicide & suicide in the major regions of several nations of the world. The nations are England/Wales, India, Italy, Japan, Portugal, Sri Lanka, Sweden, Taiwan, & the USA. The association between population & suicide rates was negative for 8 of the 9 nations, significantly so for two. Population density was less consistently associated with homicide or suicide rates. The direction of the association was negative for six of nine nations for suicide. (12 refs.)