There a startling degree of racial division in St. Louis County.
CensusReporter.org | Click to explore more St. Louis County demographic data. / Via censusreporter.org
On a widely used measure of segregation, it is in the 96th percentile.
In the United States, there are 325 counties and non-incorporated cities (such as Baltimore) that have at least 20,000 people and are at least 20% black. Of them all, St. Louis County is the 15th most black-white segregated, putting it in the 96th percentile.
That figure is based on the latest available census-tract-level data from the American Community Survey, and a metric known as the "index of dissimilarity," a standard measure of segregation. (No segregation metric is perfect, of course.)
The most black-white segregated county, according to this metric, is Wayne County, Michigan, home to Detroit. The least: Hertford County, North Carolina. (St. Louis city, which isn't part of St. Louis County, ranks 21st.)
Here’s another way of looking at it:
About 41% of black residents live in census tracts with populations that are 80% black. The national average: 21%.
In St. Louis County overall, approximately 23% of residents are black. But almost none of county's census tracts come close to that average — most have either far more black residents or far fewer. (Of the county's 199 tracts, just 28, or 14%, fall within 10 percentage points of the average.)
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