Iowa - Area of significance: Commerce
| 100 Block of West Broadway Historic District |
| Adair County Democrat-Adair County Free Press Building |
| Adel Public Square Historic District |
| Akron Opera House |
| Albia Square and Central Commercial Historic District |
| American Commercial and Savings Bank |
| Ames Main Street Historic District |
| Anamosa Main Street Historic District |
| Antlers Hotel |
| Apperson-Iowa Motor Car Company Building |
| Argonne Building |
| Aunty Green Hotel |
| Ausadie Building |
| Badgerow Building |
| Bailey, George A. and Mary Tinkel, House |
| Baird, E. J., House |
| Bank of Sumner |
| Baxter, H.A., Coal Company Historic District |
| Beaconsfield Supply Store |
| Bedford Commercial Historic District |
| Bedford House |
| Bedford Oil Company Station |
| Beers and St. John Company Coach Inn |
| Belle Plaine Main Street Historic District |
| Bellevue Commercial Historic District |
| Bell, John, Block |
| Best Oil and Refining Company Service Station |
| Bicksler Block |
| Blackhawk Hotel |
| Bloedel, Christian, Wagon Works |
| Bloomfield Square |
| Bohemian Commercial Historic District |
| Bohemian Commercial Historic District |
| Bohemian Savings Bank |
| Bonaparte Historic Riverfront District |
| Bowery Street Grocery Store |
| Bregant, Jean and Inez, House |
| Briggs Terrace |
| Bruce Goldfish Fisheries |
| Bruce's Snowball Market #1 Addition |
| Burlington, Cedar Rapids & Northern Freight House |
| Burr Oak House/Masters Hotel |
| Burr Oak Savings Bank |
| Business Part of Olin Historic District |
| Campbell Baking Company |
| Carson, Thomas C., House |
| Cedar Falls Downtown Historic District |
| Cedar Rapids 2nd Avenue SE. Automobile Row Historic District |
| Cedar Rapids Central Business District Commercial Historic District |
| Central Park-North Main Street Historic District |
| Chicago, Burlington, and Quincy Freight House-Chariton |
| Clark-Blackwell House |
| Clemens Automobile Company Building |
| Coggon Commercial Historic District |
| Colfax Spring City Commercial Historic District |
| College Corner Commercial Historic Business District |
| Commercial Hotel |
| Community Building |
| Corning Commercial Historic District |
| Courthouse Square Historic District |
| Crescent Warehouse Historic District |
| Cundill Block |
| Davenport Crematorium |
| Davenport Downtown Commercial Historic District |
| Davenport Hotel |
| Davenport Motor Row and Industrial Historic District |
| Decorah Commercial Historic District |
| Donahue Building |
| Dow House |
| Downtown Commercial Historic District |
| Downtown Commercial Historic District |
| Dows Street Historic District |
| Dr. Salsbury's Laboratories, Main Office and Production Laboratory Building |
| Dubuque Trading Post-Village of Kettle Chief Archeological District |
| Dugan's Saloon |
| East Des Moines Commercial Historic District |
| East Des Moines Industrial Historic District |
| Eldora Downtown Historic District |
| Elgin Block, The |
| Elkader Downtown Historic District |
| Elliott Furniture Company |
| Ellsworth-Jones Building |
| Equitable Life Insurance Company of Iowa Building |
| Etzel, John L., House |
| Farmers Mutual Reinsurance Company Building |
| Farmers Savings Bank |
| Farmers' State Bank |
| Fellows, James C., House |
| Firestone District Office and Warehouse |
| First National Bank |
| First National Bank Building |
| First National Bank of Pomeroy |
| Flynn-Griffin Building |
| Fort Dodge Downtown Historic District |
| Fort Madison Downtown Commercial Historic District |
| Fourth Street Historic District |
| Fowler Company Building, The |
| Franklin Hotel |
| Friedl Bakery Building |
| Front Street (River Park Drive) Historic District |
Data from United States Park Service and Wikidata
