Does anyone know of a source for historical zip code boundaries? The shapefiles are on the ESRI Data & Maps DVDs, which we have back to 1996, but a researcher is looking for data back to 1980, at which point Data & Maps did not exist. Thanks, Jennie Jennie Murack Geospatial Data Librarian and Statistics Specialist MIT Libraries, 7-238 617-258-6680 [log in to unmask]