The Milan Area Historical Society collection consists of Visual Materials and Collected Historical Materials. The Visual Materials includes postcards and photographs of the Milan area dating from the 1860s to 2006. Also included are photographic negatives of Paul Holcomb who was both a private photographer and photographer for the Milan newspaper. The Collected Historical Materials includes documentation of area businesses, community events, prominent individuals and families, organizational records, high school materials, and newspaper clippings dating to 2008. A series titled 2018 Accessions includes additional overlapping materials from the Visual Materials and Collected Historical Materials series.