These datasets include small mammal population data collected by Richard Manville (1940-1942), Phillip Myers (2003), and Allison Poor (2004-2005). Small mammal traps were initially placed in 8 locations throughout the Huron Mountains in Michigan's Upper Peninsula from 1940-1942 by Richard Manville. Small mammals present in the traps were recorded once each year and twice in 1941. This study was repeated by Phillip Myers and Allison Poor from 2003-2005.