Abstract: Systems and methods for automatically importing, refreshing and maintaining corrections to a list of contacts through addition, deletion, and change detection, and for merging disparate sources of data into a single unified list of contacts, according to configurable rule sets for resolving conflicts between the merged sources' values for any given field. Record sets are compared and automatically matched without requiring a unique contact identifier or key field; new records and deleted records are detected; conflicting information for any given field in a record is resolved; and updates to a local database are applied such that any override or augmentation of the data in the local database can persist for a given record. Multiple overlapping contact data sources are merged so as to identify common records, and the data combined so as to preserve as much information as possible, while concurrently handling conflicting data as it is encountered.