New statistics by the CDC show less educated Americans and people living in certain states such as Kentucky and West Virginia still have rates of heart disease well above the national average.
Overall, 6 percent of adults had heart disease in 2010. That is down from 6.7 percent in 2006.
Better treatments for high blood pressure and high cholesterol as well as declines in smoking may explain the trend.
The report is published in Morbidity and Mortality Weekly Report.