Iowa - Area of significance: Transportation
| Administration Building, U.S. Naval Air Station Ottumwa |
| American House |
| Ames Main Street Historic District |
| Ayrshire Apartments |
| Baker, C. H., Double House |
| Bartlett, Walter M., Double House |
| Beers and St. John Company Coach Inn |
| Belle Plaine Main Street Historic District |
| Bellevue Commercial Historic District |
| Best Oil and Refining Company Service Station |
| Bloedel, Christian, Wagon Works |
| Boone Viaduct |
| Brown Street Historic District |
| Burlington and Missouri River Railroad Passenger Station |
| Burlington, Cedar Rapids, and Minnesota Railroad: Walker Station |
| Burlington, Cedar Rapids and Northern Railroad Passenger Station |
| Burlington, Cedar Rapids, and Northern Railroad-Rock Rapids Station, Railroad Track and Bridge |
| Burlington, Cedar Rapids & Northern Freight House |
| Burlington, Cedar Rapids & Northern Passenger Depot-Dows |
| Burlington, Cedar Rapids & Northern Passenger Station-Vinton |
| Burlington Depot |
| Calmar Passenger Depot |
| C B & Q Passenger Depot |
| Cedar Rapids 2nd Avenue SE. Automobile Row Historic District |
| Central City Commercial Historic District |
| Chamberlin, Clarence D., House |
| Chicago and North Western Office Building/Passenger Depot-Lake City |
| Chicago and North Western Passenger Depot |
| Chicago, Burlington and Quincy Depot |
| Chicago, Burlington, and Quincy Freight House-Chariton |
| Chicago, Burlington and Quincy Railroad-Creston Station |
| Chicago, Burlington and Quincy Station |
| Chicago, Burlington Northern and Quincy Depot |
| Chicago, Great Western Railroad-Waterloo Freight Depot |
| Chicago, Milwaukee and Pacific Railroad-Albert City Station |
| Chicago, Milwaukee, and St. Paul Railroad-Grafton Station |
| Chicago, Milwaukee, St. Paul and Pacific Freight House |
| Chicago, Milwaukee, St. Paul and Pacific Railroad Company Depot |
| Chicago, Milwaukee, St. Paul & Pacific Combination Depot-Hornick |
| Chicago, Milwaukee, St. Paul & Pacific Depot-Delmar |
| Chicago, Rock Island and Pacific Passenger Depot-Pella |
| Chicago, Rock Island and Pacific Railroad Passenger Depot |
| Chicago, Rock Island and Pacific Railroad Passenger Station |
| Chicago, Rock Island and Pacific Railroad Stone Arch Viaduct |
| Chicago,Rock Island and Pacific Railroad: Stuart Passenger Station |
| Chicago, Rock Island and Pacific Railroad-Wilton Depot |
| Chicago, Rock Island & Pacific Railroad Depot |
| Chicago, Rock Island & Pacific Railroad Passenger Depot |
| Cody Road Historic District |
| Coffin, Lorenzo S., Burial Plot |
| Corbett's-Eby's Mill Bridge |
| Crescent Warehouse Historic District |
| Curtis, Gen. Samuel R., House |
| Davenport Motor Row and Industrial Historic District |
| Dawley House |
| Dayton Stagecoach Inn and Tavern Historic District |
| Decorah Commercial Historic District |
| Des Moines River Locks No. 5 and No. 7 |
| Des Moines Western Railway Freight House |
| Diamond Jo Boat Store and Office |
| Dodge, Grenville M., House |
| Dows Street Historic District |
| Dowtown Perry Historic District |
| Dubuque Freight House |
| East Des Moines Industrial Historic District |
| Elkader Downtown Historic District |
| Farm Creek Historic District |
| Fenelon Place Elevator |
| Franklin Apartments |
| GEO. M. VERITY |
| Great Northern Railway Steam Locomotive No. 1355 and Tender 1451 |
| Herndon Hall |
| Herring Hotel |
| Highwater Rock |
| Historic Railroad District |
| Horton-Suiter House |
| Hotel Hurst Garage |
| Hotel Lester-Lester Cafe |
| Hotel Mealey |
| Hotel Whitney |
| Hubbell Warehouse |
| Illinois Central Railroad Yard-Cherokee |
| Iowa Falls Union Depot |
| Iowa State Highway Commission, District 6 Building |
| Kattenbracher House |
| Keokuk Lock and Dam |
| Keokuk Union Depot |
| Klondike Hotel |
| Kreinbring Phillips 66 Gas Station |
| Kromer Flats |
| La Porte City Station |
| LeClaire, Antoine, House |
| Lincoln Highway Bridge |
| Lincoln Highway-Buttrick's Creek Abandoned Segment |
| Lincoln Highway-Buttrick's Creek to Grand Junction Segment |
| Lincoln Highway-Grand Junction Segment |
| Lincoln Highway-Little Beaver Creek Bridge |
| Lincoln Highway Marker (1) |
| Lincoln Highway Marker (2) |
| Lincoln Highway-Raccoon River Rural Segment |
Data from United States Park Service and Wikidata
