Naturally durable woods have a variety of commercial uses. Natural resistance to decay has been evaluated in field and laboratory tests of wood from many species, but there are few places where commercial wood users can find comparative assessments of natural durability. In this report, previous studies have been used to assign a numerical resistance rating to 1500 wood species. Species are listed alphabetically by scientific name, along with trade name, decay resistance rating, growing region, and source of resistance information. Species are also listed alphabetically by trade name if available, in the appendix.