NOTE: Gray indicates insufficient data or a suppressed estimate.
Non-Hispanic Black population concentration in the Boston metro area is sharply clustered in a band of zip codes south of downtown Boston—likely corresponding to Roxbury, Dorchester, and Mattapan—where percentages reach 40–60% or higher, with one zip code appearing to exceed 50%. Surrounding suburbs including Newton, Waltham, Somerville, and Quincy remain overwhelmingly low, generally below 5–10%, creating a stark contrast between the southern Boston core and the broader metro. Lynn stands out as a modest secondary cluster in the north with slightly elevated percentages relative to its immediate neighbors, though still well below the southern Boston concentration.
Data: U.S. Census Bureau, 2023 ACS
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