Improvements in infant mortality (death less than 1 year of age) have been experienced by the United States and Alaska over the past decade. The decline in the Alaska neonatal mortality (death less than 28 days of age) rate has been the major factor in our improved infant mortality rate. Alaska's neonatal mortality rate is one of the lowest in the U.S. However, postneonatal mortality (28 days to 1 year of age) rate has not declined and is one of the highest in the U.S. In this study we used vital statistics records to examine socio-demographic and inter-regional factors that may help to explain Alaska's apparently high postneonatal mortality rate. The study population consisted of all live born infants in Alaska for 1975 to 1985, who died in infancy. The Alaska neonatal mortality rate has been lower, but postneonatal mortality rate has been higher than the U.S. average for the period under consideration (p less than .05). Comparison of alaska postneonatal mortality rate from 1975 to 1985 with the U.S. found Alaska Non-natives have higher postneonatal mortality rates than U.S. White, and Alaska Native have higher postneonatal mortality rates than other U.S. minorities. The rural areas of Alaska have a higher postneonatal mortality rate than urban areas, a phenomenon also observed for the U.S. as a whole.