NOTE: Gray indicates insufficient data or a suppressed estimate.
College towns drive the most prominent outliers, with deep purple zones around Amherst/Northampton in the Pioneer Valley and near Boston-area universities indicating median ages below 25. Cape Cod and the Islands stand out as the oldest region in the state, with consistently yellow shading reflecting median ages above 55, while much of the suburban belt west and south of Boston clusters in the 40–50 range. Western Massachusetts displays notably higher variability than the eastern half, with adjacent zip codes in the Berkshires and Hampshire County swinging between the youngest and oldest age brackets in the state.
Data: U.S. Census Bureau, 2023 ACS
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