The National Center for Health Statistics (NCHS) releases bridged-race population estimates for United States residents in order to calculate birth and death rates. These estimates are created by bridging the 31 race categories used in the 2000 and the 2010 censuses to the four race categories used previously.

This release includes US resident population estimates at the county level as of July 1, for the years 2000-2008. Estimates are by single-year age groups for ages 1 to 85+, bridged-race category, Hispanic origin, and sex. For this release, population estimates are available for single-year age groups for ages 85 to 100+ at the national level as well.