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In a series of methodological papers, we have described the Rochester Epidemiology Project (REP) medical recordslinkage system as it has existed for more than 50 years in Olmsted County, Minnesota. 1–4 Further details about the major events and protagonists of the history of the original REP are available elsewhere. 1 Starting in 2010, we have expanded the population captured by the REP from a single county in south-eastern Minnesota to a geographical region including 27 counties in southern Minnesota and western Wisconsin. In this paper, we provide a profile of the expanded medical records-linkage system, which we name the Expanded-REP (E-REP) to distinguish it from the original REP. Because the data became available for electronic linkage and storage starting in 2010, we can consider 2010 the birth year for the E-REP.