Metro Plates
Black Boston: Concentration and Share
In Boston, concentration is the metro question in its purest form: how much of a place is Black, and how that share compares with the state and the nation around it. In the Boston metro, Black residents number about 160,000 and form 24% of the population on the alone-or-in-combination count — against 8% for the state as a whole on the alone count, and 13.5% for the United States.
The Share and What It Builds
A share is not a statistic in the abstract; at 24%, it is the composition of every school, congregation, electorate-sized gathering, and customer base in the metro. In Boston, shares at this level sustain institutions — media, congregations, businesses, and political organizations — that smaller shares cannot, and they shape how a metro appears in every national table this atlas publishes. The Boston figure also explains the metro's gravitational pull in the movement plates: concentration is itself an attraction, drawing new residents toward an established community with its institutions already built.
In Boston, that pattern is the plate's whole subject: the table below gives the published share and count, and the map shades the share. Boston holds about 160,000 Black residents within the city — Black alone or in combination, roughly a quarter of its people — and close to half a million across the metropolitan area, about a tenth of the region. Read back against the table, the general pattern resolves into Boston's particular numbers.
In Boston, that pattern is the plate's whole subject: the table below gives the published share and count, and the map shades the share. The city's Black geography centers on a contiguous arc of neighborhoods in its southern half. The table is where the general pattern becomes Boston's own figures.
Reading This Plate
What separates the two definitions is the multiracial population — real, growing, and small against shares of the size recorded in Boston. The definitions differ by the multiracial population — a real and growing count, small against shares like Boston's. Boston's place in that ordering is its concentration signature.
In Boston, that pattern is the plate's whole subject: the table below gives the published share and count, and the map shades the share. Greater Boston's Black population is, by the birthplace data, among the most immigrant of any in this section. In Boston, held against the national currents, the state's own rows say how its movement stands.
The distribution reads at state scale in Boston, where the table's rows give the published count and the share the map draws. Stoughton, Milton, Quincy, and the Route 128 belt add growing communities, while Cambridge and Somerville hold smaller, older Black populations under severe housing-cost pressure — the tract data show declining Black counts in the inner core even as the metro total rises, Boston's version of the displacement arithmetic. That is what a benchmark is for in an atlas: not to rank Boston, but to locate it.
A note on this plate's figures, stated once and plainly: Black residents of the Boston metro, alone or in combination: 160,000; Black share of the Boston metro population, alone or in combination: 24%; Black share of the state population, alone: 8%. In Boston, each figure is published by the source named below and rounded as published; the plate's map shades the Black share of the population on the same basis, so the table and the map can be read against each other without conversion.
How this plate is read, for Boston: begin with the map, whose shading bands the published Black share into the legend's five classes, then turn to the table, which states the measures in figures — Black residents of the Boston metro, alone or in combination: 160,000; Black share of the Boston metro population, alone or in combination: 24%. Where the general meets the particular is the table of Boston; read the two together.
The record behind this plate of Boston is published, not estimated by this atlas: U.S. Census Bureau, 2020 Census; American Community Survey; Population Estimates Program. Where the table carries a national benchmark row for Boston, the row is labeled with the basis it is published on — the same measure, the same basis, two geographies.
How this plate is read, for Boston: begin with the map, whose shading bands the published Black share into the legend's five classes, then turn to the table, which states the measures in figures — Black residents of the Boston metro, alone or in combination: 160,000; Black share of the Boston metro population, alone or in combination: 24%. For Boston, the two presentations are one record in two forms, and a reader who checks one against the other has the plate's whole method in hand.
| Measure | Figure |
|---|---|
| Black residents of the Boston metro, alone or in combination | 160,000 |
| Black share of the Boston metro population, alone or in combination | 24% |
| Black share of the state population, alone | 8% |
| Black share of the United States population, alone (population estimates) | 13.5% |
Source: U.S. Census Bureau, 2020 Census; American Community Survey; Population Estimates Program. Method: Figures are drawn from the published federal sources named on this page, for the geography named; tile shading bands the published Black population share into the five legend classes. Counts are rounded as published by the source agency, and national benchmark rows are labeled with the basis they are published on.