This dataset presents the Household Vulnerability Index (HVI) for the municipalities of the Metropolitan Area of Thessaloniki. The index was derived by integrating household-size variations with demographic and environmental indicators, enabling comparative assessment of household vulnerability across municipalities. The source datasets were semantically modelled using the RDF Data Cube Vocabulary, transformed into RDF, and uploaded into a shared Knowledge Graph. The final HVI values were produced through SPARQL-based integration queries, resulting in a ranked list of municipalities according to their Household Vulnerability Index. The dataset supports evidence-based policymaking, urban resilience planning, and social-impact analysis by enabling standardized comparison of household vulnerability patterns across administrative areas.