Iowa - Area of significance: Exploration/Settlement
| Albright, Henry D. and Juliana (Wortz), House |
| Allen, James, Stone Barn |
| Armstrong, George and Susan Guiberson, House |
| Bank of Sumner |
| Bauman, Augustus and Elizabeth (Huntsberger), House |
| Bethel Church |
| Bevington, C. D. and Eliza Heath, Privy |
| Bevington, C. D., House and Stone Barn |
| Boyle, Hugh and Matilda, House and Cemetery Historic District |
| Brown, James, House |
| Burlington, Cedar Rapids, and Minnesota Railroad: Walker Station |
| Burr Oak House/Masters Hotel |
| Carson, Thomas C., House |
| Case, Larnerd, House |
| Cassel, Carl and Ulrika Dalander, House |
| Caulkins, Dr. Martin H., House and Office |
| Chicago, Milwaukee, St. Paul & Pacific Combination Depot-Hornick |
| Chicago,Rock Island and Pacific Railroad: Stuart Passenger Station |
| Church of St. John the Baptist |
| Church, Seymour, House |
| Clark, Gerome, House |
| Collins-Bond House |
| Concord Congregational Cemetery |
| Cook-Johnson House |
| Cottage Hill Methodist-Episcopal Cemetery |
| Cretsinger, John, House |
| Davenport Village |
| Davis, Timothy, House |
| Dayton Stagecoach Inn and Tavern Historic District |
| Delmar Calaboose |
| Drake, John and Amanda Bigler, House |
| Drake University Campus Historic District |
| Dubuque Trading Post-Village of Kettle Chief Archeological District |
| Duncan-Duitsman Farm Historic District |
| Duncan, John M., House |
| Early, John and Elizabeth McMurn, House |
| Evans, Henry and Elizabeth Adkinson, House |
| Farmhouse, Olmsted Family |
| Fay, Pliny and Adelia, House |
| Fellows, James C., House |
| First Lutheran Church |
| Florence-Council On The Iowa Site |
| Ford, W. T., House |
| Fort Atkinson Historic District |
| Franklin Regular Baptist Church |
| Gannon, M. V., House |
| Gehlen House and Barn |
| Gracehill Moravian Church and Cemetery |
| Green, William, House |
| Henderson, Daniel and Nancy Swaford, House |
| Hibernia Hall |
| Holmes, John S. and Elizabeth Beem, Barn |
| Hornback, Emily, House |
| Horn House |
| Iowa Reform Building |
| Iron Post |
| Jacobson Farm |
| Kellogg, Miles and Elizabeth Smith, House |
| Kerndt, G., & Brothers Office Block |
| Kirchner, Philip and Anna Parrish, Log House |
| Knott, Adams R., Frederick L. and Martha (Taylor), House |
| Langworthy House |
| LeClaire, Antoine, House |
| Lenox Township Church of the New Jersalem |
| Letovsky-Rohret House |
| Lewelling, Henderson, House |
| Luther College Farm |
| Manatt, William, House |
| Maysville Schoolhouse |
| McDonald House |
| McQuie, Peter and Isabelle McCulloch, Milkhouse |
| Mentzer, Joseph P., House |
| Mines of Spain Area Rural Community Archeological District |
| Mines of Spain Lead Mining Community Archeological District |
| Missouri, Iowa & Nebraska Railway Co. Depot-Weldon |
| Motor Townsite |
| Nelson, Daniel, House and Barn |
| Nichols, Benjamin F. and Susan M. (Jenkins), House |
| Nichols, Samuel, House |
| Nichols, William Anzi, House |
| Oakland Cemetery |
| Ogburn, William, House |
| Old East Paint Creek Lutheran Church |
| Paradise Farm |
| Pease, Dr. Luther L. and Susette E. (Baker), House |
| Pilot Grove |
| Pine Mills German Methodist Episcopal Church |
| Presbyterian Church |
| Queen, Hogan and Martha A. Runkle, House |
| Red Oak Grove Presbyterian Church and Cemetery |
| Sacred Heart Roman Catholic Cathedral Complex |
| Saengerfest Halle |
| Schindhelm-Drews House |
| Schnellbacher, John and Fredericka Meyer, House |
| Scholte, Dominie Henry P., House |
| Schrup, John and Marie (Palen) Farmstead Historic District |
| Sciola Missionary Baptist Church |
| Seerley, William and Mary (Messersmith) Barn and Milkhouse-Smokehouse |
| Sergeant Floyd Monument |
| Severson, Nels, Barn |
Data from United States Park Service and Wikidata
