BEA county and metropolitan area per capita personal income statistics are calculated by dividing population into personal income. BEA used Census population figures to calculate annual per capita personal income statistics for 2020 and 2021. For 2010 through 2019, BEA produced intercensal annual county and metropolitan area population statistics that are tied to the Census Bureau decennial counts for 2010 and 2020. BEA developed intercensal population statistics because this data was not published when Census released county and metropolitan area population data for 2020 and 2021, which are based on the 2020 decennial counts. Census will release official intercensal population data in 2023.
BEA produced intercensal population figures to create consistent time series that are used to prepare per capita personal income statistics. BEA used the Census Bureau Das Gupta method, modified to account for an extra leap year day, to produce the intercensal population figures that will be used until Census releases its official intercensal population data.