Franklin Butler Winneshiek Allamakee Kossuth / Fayette Bremer Tama Marshall Benton / Harrison Audubon Shelby Guthrie Dallas / Shelby Guthrie Dallas Polk Jasper / Adair Madison Warren Marion / Ida Monona / Calhoun Crawford Carroll Webster Hamilton / Tama Marshall Benton Jones Linn Jackson Clinton / Clayton Buchanan Delaware Dubuque Grundy / Johnson Scott Muscatine Pottawattamie Cass Adair / Carroll Webster Hamilton Boone Greene / Floyd Chickasaw Wright Franklin Butler / Brien Clay Palo Alto Plymouth / Boone Greene Clayton Buchanan Delaware / Lucas Wayne Monroe Appanoose Wapello Davis Jefferson / Lyon Osceola Dickinson Emmet Winnebago / Davis Jefferson Henry Van Buren Lee / Clarke Decatur Lucas Wayne Monroe / /