The Monoculture Map: Greater Boston's Most Homogeneous Towns, Ranked by the Census

We built one transparent, editorial composite from three public ACS measures. (1) Racial concentration — the share held by the single largest race/ethnicity group. (2) Credential concentration — share of adults 25+ with a graduate or professional degree. (3) Income elevation — median household income. A town scores 'high homogeneity' when one race dominates AND the credential/income bands are narrow and extreme. This is our index, not a Census product — the underlying numbers are the Census's; the ranking and framing are ours. Here is the metro, most homogeneous first by single-group racial share.

The numbers: 92.7% white non-Hispanic, 0.7% Black, 0.2% Asian, 4.1% Hispanic. Median household income $199,306. Median home value $1,318,900. The read: Cohasset is old-money coastal homogeneity, not credential homogeneity — its graduate-degree rate (34.4%) is actually the lowest in the wealthy cluster. This is wealth that predates the knowledge economy: harbor, yacht club, sea captains' houses, and a racial composition that has barely moved while the rest of Eastern Massachusetts diversified. Perception says 'charming seaside town.' The data says one of the most racially uniform municipalities in the metro, full stop.

The numbers: 92.6% white non-Hispanic, 2.4% Asian, 0.3% Black, 2.4% Hispanic. Median income $178,390; median home value $1,134,200. The read: Hingham and Cohasset are statistical twins — two adjacent South Shore towns each more than 92% one race. Together they form the metro's whitest contiguous block. The marketing brochure word is 'historic.' The ACS word is 'homogeneous.' Both are accurate; only one is on the Chamber of Commerce website.

The numbers: 83.2% Hispanic, 11.6% white non-Hispanic, 2.0% Black, 1.7% Asian. Median household income $60,433 — the lowest in our set. 16.8% of adults hold a bachelor's; 5.1% hold a graduate degree. Median home value $415,200. The read: Lawrence is every bit as homogeneous as Cohasset — more so, by some measures, given its income and education compression — yet it is described in the press as a 'gateway city,' never an 'exclusive enclave.' The vocabulary flips with the tax base. When a town is 92% white and rich, we call it desirable. When a city is 83% Hispanic and working-class, we call it a problem to be fixed. That asymmetry is the story.

The numbers: 84.3% bachelor's+, 58.6% graduate/professional degree, median income $238,444. Racially, Lexington is the metro's most striking outlier: 55.2% white, 33.8% Asian. The read: Lexington proves homogeneity isn't always about race — it is one of the more racially mixed affluent towns in the state. Its monoculture is credential and class. This is a town organized around the advanced degree, the magnet-grade school district, and the income required to buy in ($1.2M median home). Wealth here does not equal whiteness; it equals a diploma and the price of entry. A different kind of sameness, but sameness all the same.

The numbers: Median household income reported at the Census top-code of $250,001+ — meaning the survey literally cannot measure how high it goes. 84.3% bachelor's+, 53.8% graduate degrees. 70.9% white, 14.9% Asian. Median home value $1,694,400 — the highest in our set. The read: Weston is where wealth homogeneity becomes statistically invisible because it exceeds the instrument. Five towns in our set top-code their income (Weston, Dover, Carlisle, Sherborn, Wellesley); the real medians are unknown and higher. You cannot integrate a town economically when the floor to enter is a seven-figure home and the median family out-earns the federal survey's ceiling.

The numbers: 80.6% white, 8.5% Asian, 0.2% Black, 2.5% Hispanic. Income tops out at $250,001+; 48.5% hold graduate degrees. The read: Sherborn, along with Hingham (0.3% Black), Sudbury (0.5%), and Wayland (0.6%), forms a ring where the Black population is a rounding error. Compare the Black-plurality towns below and the metro's actual structure appears: not integrated, but sorted. The largest minimum-lot-size requirements in the state cluster in exactly these towns — a legal mechanism that produces racial outcomes without ever mentioning race.

The numbers: 85.0% bachelor's+, 57.5% graduate degrees, median income $142,101, median home value $1,246,800. 64.1% white, 19.3% Asian, 6.2% Hispanic, 3.0% Black. The read: Brookline is the archetype of the progressive paradox — a town that votes overwhelmingly for integration and affordability in the abstract while its own numbers describe a credentialed, expensive, racially-skewed enclave. It is more diverse than the South Shore trophy towns, less diverse than its own self-image. The gap between Brookline's politics and Brookline's parcel map is the most-litigated question in Massachusetts housing policy, and the ACS doesn't take sides — it just reports the parcel map.

The numbers: Randolph — 39.8% Black, 27.4% white, 12.3% Asian, 14.4% Hispanic; income $109,573; home value $496,400. Brockton — 33.5% Black, 26.8% white, 12.6% Hispanic; income $80,115; home value $437,500. The read: These towns carry the regional Black population that the wealthy ring rounds to zero. They are diverse in a way Cohasset is not — multiple groups materially present — yet concentrated enough to read as their own kind of monoculture, defined by class and the price ceiling that keeps wealth from arriving. The data exposes the double standard in how we narrate concentration depending on who is concentrated.

The numbers: 67.3% Hispanic, 17.7% white, 7.1% Black, 2.1% Asian. Median income $72,179; 22.2% bachelor's+. The read: Chelsea sits minutes from Boston and not far from Brookline ($142,101 median income, double Chelsea's). It is one of the densest, most Hispanic, most immigrant communities in New England — a homogeneity of arrival and aspiration rather than exclusion. The contrast with the credential fortresses is the whole metro in two data points: same labor market, same transit lines, half the income, a quarter the degrees, and a world apart.

The read: Malden demonstrates that a Greater Boston town can be genuinely mixed across race, class, and education — four groups all materially present, a middle home-value band, a real spread of credentials. That it is the lone clear example among 25 towns is the point. Integration in this metro is not the default state that diversity branding implies; it is the rare exception, and it tends to happen in middle-priced, transit-rich cities that never erected the lot-size walls — not in the towns that talk the most about belonging.

Right: Greater Boston is extraordinarily educated and wealthy at the top. Lexington, Brookline, Weston, and Wellesley really are among the most credentialed, highest-income communities in the United States. The perception of elite concentration is accurate.

Ignored: That concentration has a racial and economic shadow the brochures omit. The same data that crowns Lexington's graduate-degree rate records Lawrence's 5.1%. The same map that prices Cohasset at $1.3M zones the Black population into Randolph and Brockton at a third of that. 'Diverse metro' is true only as an average across tiles that are each internally uniform — the statistical equivalent of standing with one foot in ice water and one in boiling and calling yourself comfortable on average.

The mechanism, not the malice: None of this requires anyone in any town to hold a bad thought. It requires only minimum lot sizes, single-family-only zoning, and seven-figure entry prices — policies that produce racial and economic outcomes without ever naming race or income. The towns at the top of this index are, overwhelmingly, the towns with the largest minimum-lot requirements and the loudest resistance to the MBTA Communities Act. Homogeneity here is not a vibe. It is a build spec.

Data source. All figures are U.S. Census Bureau American Community Survey (ACS) 2020–2024 5-year estimates, drawn from detailed tables B19013 (median household income), B25077 (median owner-occupied home value), B15003 (educational attainment), and B03002 (race/Hispanic origin), accessed via Census Reporter and data.census.gov. Geographies are municipalities (town/city), not counties or census-designated places.

Race definitions. 'White,' 'Black,' and 'Asian' are non-Hispanic alone; 'Hispanic' is of any race (per table B03002). Shares do not sum to 100% because 'some other race' and 'two or more races' are omitted for brevity.

Estimates, not census counts. ACS 5-year figures are statistical estimates with margins of error; small towns have wider intervals. Five towns (Weston, Dover, Carlisle, Sherborn, Wellesley) report median household income at the Census top-code of $250,001, which is a ceiling, not a point estimate — the true median is at or above it.

The Homogeneity Index is editorial. The ranking and the term 'monoculture' are this publication's framing of the underlying public data, not a Census Bureau product or an official designation.

Primary data: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates — https://data.census.gov (tables B19013, B25077, B15003, B03002). Town-level profiles via Census Reporter — https://censusreporter.org.

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