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Significance Current knowledge on which geographic scale matters the most for inequalities in longevity in the United States is largely confined to counties, which have been the smallest unit at which national data on life expectancy were available. Making the inference that “counties make a difference” simply because “counties differ” is potentially problematic. In this systematic investigation of ascertaining the relative importance of three geographic scales: states, counties, and census tracts (CTs), we find that more than three-fourths of the total variation in life expectancy is attributable to CTs. This indicates that population inequalities in longevity are primarily a local phenomenon, and there is a need for greater precision and targeting of local geographies in public policy discourse.

Quantifying and explaining variation in life expectancy at census tract, county, and state levels in the United States