Many national, state, and private organizations with Web sites are listed below. If you don't see a barn preservation organization for your state, try contacting your state's historical society. They can often put you in contact with barn preservation groups in your state that are not listed here.
National Trust for Historic Preservation
(Note: the BARN AGAIN! Program is no longer active).
National Park Service, Preservation Brief 20 - Preservation of Historic Barns
Go to the Iowa DOT map, then click on a County.