A new study has found that how long Americans live depends on where they live. Researchers at the Institute for Health Metrics and Evaluation or IHME at the University of Washington in Seattle found that the gap between counties with the highest and lowest life expectancies is larger now than it was in 1980. And life expectancy is falling in some counties. The researchers say this shows there is a large “and growing inequality in the health of Americans.” Several counties in the states of North and South Dakota, where many Native Americans live, have the lowest life expectancy rate. In Oglala Lakota County, South Dakota, the life expectancy was 66.8 in 2014. There has also been a drop in the life expectancy rate in counties in poor areas of Kentucky and West Virginia. In Owsley County, Kentucky, life expectancy was 72.4 years in 1980. But by 2014 it had fallen to 70.2. Some of the counties with the highest life expectancy are in the western state of Colorado. Summit County had the longest life expectancy at 86.8 years. It was 86.5 in Pitkin County and 85.9 in Eagle County. The average life expectancy in the United States was 79.1 in 2014.