The Population for the demographic variables (County/State, Year, Age, Sex, and Race/Ethnicity) as specified in the corresponding row.
In non-census years and the year 2020, race/ethnicity population data are only available for a few counties (see Race/Ethnicity help for more details).
Source: Census years (1990, 2000, and 2010) are obtained from the U.S. Census Bureau. Non-census years (e.g., 1991, 1992, 2011, 2012, etc.) and year 2020 population estimates are obtained from the Pennsylvania State Data Center.
2020 Census data by detailed demographic groups was not available at the time of publication, so 2020 estimates from Pennsylvania State Data Center were used.