Iowa - Area of significance: Commerce
| Montezuma Downtown Historic District |
| Motor Mart Building |
| Mylius-Eaton House |
| Netcott-Pfeiffer House |
| Nevada Downtown Historic District |
| Newens Sanitary Dairy Historic District |
| New Era Building |
| New Providence Building Association Stores |
| Newton Downtown Historic District |
| Northwood Central Avenue Historic District |
| Oakland, William, Round Barn |
| Old Fort Madison Site |
| Old Main Historic District |
| Osage Commercial Historic District |
| Osceola Commercial Historic District |
| Overland Waterloo Company Building |
| Oxford Commercial Historic District |
| Paradise Farm |
| Park/Glen Avenues Historic District |
| Park Hotel |
| Peak, George B., House |
| Peoples Nationals Bank |
| Petersen's, J. H. C., Sons Store |
| Pioneer Implement Company |
| Pioneer Oil Company Filling Station |
| Pleasant View Stock Farm Historic District |
| Preston’s Station Historic District |
| Primrose Mill |
| Public Square Historic District |
| Putnam-Parker Block |
| Quasdorf Blacksmith and Wagon Shop |
| Ramsey Building |
| Rath Packing Company Administration Building |
| Ray, Frank G., House & Carriage House |
| Redfield GAR Hall |
| Reeves, Isaac and Agnes (Bells), House |
| Register and Tribune Building |
| Renken, Renke and Wubke, House |
| "Reynolds, Joseph ""Diamond Jo,"" Office Building and House" |
| Rogers-Knutson House |
| Roshek Brothers Department Store |
| Ross Grain Elevator |
| Rumely-Des Moines Drug Company Building |
| Salisbury House |
| Sanborn, C. M., Building |
| Sandwich-Marseilles Manufacturing Building |
| Sargent's Garage |
| Savery Hotel |
| Schantz, Christian K. and Margaret (Rich), House and Carpentry Shop |
| Schroeder-Klein Grocery Company Warehouse |
| Schultz Brothers Drug Store |
| Scotch Grove Historic District |
| Security Building |
| Seth Richards Commercial Block |
| Sexton Hotel |
| Sheaffer, Walter A., House |
| Sherman Nursery Company Historic District |
| Shores-Mueller Company |
| Siebels' Department Store-Boyer Valley Bank |
| Simmons Hardware Company Warehouse |
| Sinclair Building-Smulekoffs Furniture Store |
| Singmaster, C.F. and Mary, House |
| Sioux Theatre |
| Smith, Peter and Mary, House |
| Smouse, Winfield, House |
| Squiers, J. E., House |
| Standard Glass and Paint Company Building |
| Starker-Leopold Historic District |
| State Bank of Stratford |
| State Center Commercial Historic District |
| Syndicate Block |
| Taft-West Warehouse |
| Tastee-Freez Drive In and Dairy Store |
| Teachout Building |
| Terrace Park Historic District |
| Union Bakery |
| Union Brewery |
| Union Savings Bank and Trust |
| Upper Central Avenue Commercial Historic District |
| Upper Main Street Historic District |
| Valley Auto Co.-Morgan Auto Co. Garage |
| Valley Junction Commercial Historic District |
| Wahkonsa Hotel |
| Walnut Tire and Battery Co.-Globe Publishing Company Building |
| Warnock Building |
| Warrior Hotel |
| Washington Avenue Commercial Historic District |
| Washington Downtown Historic District |
| Waterloo East Commercial Historic District |
| Waterloo West Commercial Historic District |
| Waverly East Bremer Avenue Commercial Historic District |
| Waverly House |
| Wells, George A., House |
| West Branch Commercial Historic District |
| West Jefferson Street Historic District |
| West Liberty Commercial Historic District |
| West Side Third Avenue SW. Commercial Historic District |
| West Union Commercial Historic District |
| Wetherby, Isaac A., House |
| White, H. A., General Store and House |
Data from United States Park Service and Wikidata
