In the Research Letter titled “Age-Adjusted Mortality Rates and Age and Risk–Associated Contributions to Change in Heart Disease and Stroke Mortality, 2011-2019 and 2019-2020,”[1] published March 23, 2022, there was an error in the Results section. In the second sentence of the first paragraph of the Results section, the values for the total age-associated increase in heart disease deaths covered the period between 2011 and 2019. This article has been corrected.[1]