% of Population without Health Insurance, by Zip Code (ZCTA5) — Massachusetts

NOTE: Gray indicates insufficient data or a suppressed estimate.

Massachusetts exhibits notably low uninsured rates statewide, with the vast majority of zip codes falling below 5%, consistent with the state's longstanding universal healthcare mandate. Slightly elevated uninsured pockets appear in parts of the Greater Boston metro area and select urban centers in the central and western portions of the state, likely reflecting immigrant communities or populations facing enrollment barriers. The gray (no-data) zip codes scattered throughout the western highlands and parts of Cape Cod likely correspond to sparsely populated or institutionally dominated areas with suppressed Census estimates.

Data: U.S. Census Bureau, 2023 ACS

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