NOTE: Gray indicates insufficient data or a suppressed estimate.
Most of Connecticut's zip codes report high school graduation rates above 90%, with the highest concentrations of near-100% attainment clustered in affluent suburban areas of Fairfield County's interior, the Farmington Valley, and much of Litchfield County in the northwest. Sharp contrasts emerge in the state's urban cores—particularly Hartford, New Haven, Bridgeport, and Waterbury—where several zip codes drop below 75%, appearing as distinct teal and dark blue pockets against the predominantly yellow surrounding suburbs. The southeastern corner around New London also displays moderately lower graduation rates compared to neighboring rural and suburban zip codes, though not as pronounced as the central urban clusters.
Data: U.S. Census Bureau, 2023 ACS
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