Systems, methods, and computer-readable storage media are provided for conflating entities using a persistent entity index. Information (including attributes) pertaining to a plurality of entities is received. The received information is either matched with one or more existing entities in the persistent entity index or, if no match is found, selected for addition to the persistent entity index. The persistent entity index includes entity-attribute pairs associated therewith. Attributes associated with matching entities for which information is received are aggregated and/or reconciled with the entity-attribute pairs associated with existing entities included in the persistent entity index. The persistent entity index may be incrementally updated at predetermined time intervals to insure the accuracy and freshness of the information associated therewith.