The personality of individuals is clustered by geographic regions; a resident of a region is more similar to another resident than to a random non-resident. Research in geographical psychology often has focused on this clustering effect in broad regions, such as countries and states, using broad domains of personality, such as the Big Five. We examined the extent to which (a) a narrower geographic unit, the U.S. ZIP Code, accounted for more variance explained in aggregating personality than a broader region, the U.S. state; and (b) progressively narrower personality traits (domains, facets, and nuances, respectively) provided more information in describing personality-demographic relationships. Results from this study (n_participants = 39,886, n_zipcodes = 2,074) indicated that the variance explained by aggregating personality was multiple times as large for U.S. ZIP Codes than for states (median = 4.4). At the level of personality domains, ZIP Code population density and income disparity were positively correlated with Openness and negatively correlated with Conscientiousness and Agreeableness. Facets within each domain were differentially correlated with each demographic, which demonstrated that facets added information to the personality-demographic relationships beyond that of domains. Item-level analysis revealed the most informative finding: population density and income disparity were positively associated with personality nuances related to politically liberal beliefs, anti-authoritarian attitudes, lower concern for abiding by rules and laws, and greater beliefs of self-exceptionalism. Findings suggest that future studies in geographical and personality psychology could benefit from using the narrowest feasible unit of analysis.