USAFacts used the final intercensal estimates for 1970 through 2009 and the provisional postcensal estimates for 2010 and after. The most recent county-level data available by age, race, sex, and ethnicity are the Vintage 2020 Population Estimates (census.gov) for 2010 to 2019 and the Vintage 2022 Population Estimates (census.gov) for 2020 ... More @Wikipedia
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