CDC reports aggregate counts of COVID-19 cases and death numbers daily online. Data on the COVID-19 website and CDCs COVID Data Tracker are based on these most recent numbers reported by states,territories, and other jurisdictions. This data set of “United States COVID-19 Cases and Deaths by State over Time” combines this information. However, and data are dependent on jurisdictions timely and accurate reporting.
Separately,CDC also regularly reports provisional death certificate data from the National Vital Statistics System (NVSS) on data.cdc.gov. Details are described on the NCHS website. Reporting the number of deaths by using death certificates ultimately provides more total information but is a longer process; therefore, these numbers will be less than the death counts on the COVID-19 website.
Source: cdc.gov