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

Using ACS 2020–2024 5-year estimates, Greater Boston's towns sort into sharp demographic monocultures. On race: Cohasset (92.7% white) and Hingham (92.6%) at one pole; Lawrence (83.2% Hispanic) and Chelsea (67.3% Hispanic) at the other; Randolph (39.8% Black plurality) and Brockton (33.5% Black) as a third. On credentials: Lexington (58.6% graduate degrees) and Brookline (57.5%) versus Lawrence (5.1%). On money: at least five towns top-code the income survey at $250,001+ while Lawrence sits at $60,433. The 'diverse metro' is a mosaic of internally uniform tiles.

Demographers and researchers wanting a sourced town-level snapshot, civic leaders and policymakers weighing zoning and integration, activists documenting structural patterns, and homebuyers who want to know what a town's numbers actually say before they pay the premium.

• •Cohasset is 92.7% white non-Hispanic with 0.2% Asian; Lawrence is 83.2% Hispanic — same metro, mirror-image monocultures
• •Lexington adults are ~6x more likely to hold a GRADUATE degree (58.6%) than Lawrence adults are to hold ANY bachelor's (16.8%)
• •Brookline's median household income ($142,101) is roughly double neighbor Chelsea's ($72,179); Cohasset's median home value ($1.32M) is 3.2x Lawrence's ($415K)
• •The Black population is concentrated, not spread: 39.8% of Randolph and 33.5% of Brockton vs. 0.2% of Sherborn — roughly a 200x gap
• •Malden is the exception that proves the rule: no group above ~39%, the only genuinely integrated city in the set