Iowa - Constructed - 1900–1909
| Abraham Lincoln Statue and Park |
| All Saints Catholic Church |
| Alumni Hall |
| American Telephone & Telegraph Co. Bldg. |
| Appanoose County Courthouse |
| Argyle Flats |
| Averill, Glenn M. and Edith, House |
| Banta, J. V., House |
| Bergman, August H., House |
| Bricker-Price Block |
| Buchanan School |
| Buffalo High School |
| Chicago and North Western Office Building/Passenger Depot-Lake City |
| Chicago, Milwaukee & St. Paul Depot-Jefferson |
| Christiansen, Jens Otto, House |
| Clay County Courthouse |
| CM and StP Railroad Underpass |
| Coggon Public School |
| Council Bluffs Free Public Library |
| Davenport Bag and Paper Company Building |
| Des Moines Western Railway Freight House |
| Downey Savings Bank |
| Drake Public Library |
| Dubuque Freight House |
| Eagle Point Park Historic District |
| Eldon Carnegie Public Library |
| Farmhouse, Olmsted Family |
| First Unitarian Church |
| Ford, Arthur Hillyer, House |
| French, Alice, House |
| Greenwood Cemetery Chapel |
| Hanson, Alfred, House |
| Hawkeye Creek Bridge |
| Hawthorne Glove and Novelty Company-Shrader Drug Company Building |
| Hoffman, Phil, House |
| Hose Station No. 7 |
| Hughes, David and M. Maria, House |
| Indianola Carnegie Library |
| Iowa Wind Mill and Pump Company Office and Warehouse |
| Kromer Flats |
| Larsen, Chris, House |
| Leith, Doctor Alexander R. (A.R.) and Louisa J., House |
| Manning Water Tower |
| McClung, J. J., House |
| Murillo Flats |
| Noble-Kendall House |
| Onawa Public Library |
| Peterson Manufacturing Building |
| Ranshaw, Samuel and Emma A., House |
| Rewerts, George, House |
| Saint Patrick's Catholic Church and Rectory |
| Schultz Brothers Drug Store |
| Second Baptist Church |
| Seminole Valley Farmstead |
| Sherman, Hoyt, Place |
| Simmons Hardware Company Warehouse |
| Sinclair Building-Smulekoffs Furniture Store |
| Smith, Gen. Cass and Belle, House |
| Sokol Gymnasium |
| Sturdivant-Sawyer House |
| Thompson, Charles J., House |
| Turner, Fred G., House |
| Valley Junction-West Des Moines City Hall and Engine House |
| Wabash Combination Depot-Shenandoah |
| Waterloo Public Library-East Side Branch |
| Waterloo Public Library (West Branch) |
| Weis, Henry, House |
| Welch Apartments |
| West Chester |
| Whitehead, C. H., House |
| White, Theodore, House |
| White, W. T. S., House and Carriage House |
| Wishard, Henry, House |
| Y.M.C.A. Building |
| Zitterell, William J. and Hattie J., House |
Data from United States Park Service and Wikidata
