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Data Methodology

The Census Bureau’s Population and Housing Estimates Program (PEP) data by county includes details like counts by age, race, or ethnicity and goes back for decades.

But how the Census Bureau reported and grouped those populations changed over time.

Race categories

Users will notice that the race categories change depending on the years selected in this interactive tool.

This occurs because the Census Bureau has changed the race and ethnicity categories it makes available. To allow for comparisons over time, the race categories change depending on the earliest year selected in the comparison tool.

If the earliest year selected in the tool is from before 1990, the data only includes three race categories: 'white', 'Black', and 'other'.

As a result, any comparison that includes data from before 1990 only includes these three race categories. Race categories other than 'Black' and &#x