* Data for 2010-2014 are "postcensal" estimates; data for previous years are intercensal estimates based on two consecutive censuses.
Years Available: 1980–2019
Permanent Link: http://data.sagepub.com/sagestats/4215
General Notes: Resident population estimate for July 1 of each year. *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. **The Population Estimates Program (PEP) includes two distinct kinds of estimates: postcensal and intercensal. Postcensal estimates adjust the population counts from previous censuses using administrative data. Intercensal estimates, on the other hand, use a formula to interpolate between two decennial censuses. Intercensal estimates are considered superior to postcensal estimates by the Census Bureau. With each new release of annual estimates, all estimates are revised for all years back to the last census. Hence, when the Census Bureau released 2014 population estimates, it also revised the estimates for 2010-2013. The estimates published in a particular year are its "Vintage, " so that the estimates for 2010-2013 published in 2014 are "Vintage 2014." Vintage 2014 used the National Center for Health Statistics (NCHS) to estimate births and deaths, the Internal Revenue Service (IRS) (for ages 0-64) and Medicare enrollment (for ages 65 and older) to estimate migration within the U.S., and the Defense ManpowerData Center (DMDC) to estimate military migration.