Iowa - Criteria: C (architecture/engineering)
| Des Moines Fire Department Headquarters-Fire Station No. 1 and Shop Building |
| Des Moines River Bridge |
| Des Moines Saddlery Company Building |
| Dessaint, Marie Clare, House |
| Dexter Community House |
| Dibble House |
| Dierks, Peter, House |
| Dillon Memorial |
| Dils-Downer House |
| Dobbin Round Barn |
| Dodd, A. B. C., House |
| Dodge, Ruth Anne, Memorial |
| Dominy, John S., House |
| Donahue Building |
| Douglas, George B., House |
| Downey Savings Bank |
| Downtown Commercial Historic District |
| Downtown Commercial Historic District |
| Dows Street Historic District |
| Dowtown Perry Historic District |
| Drake, John and Amanda Bigler, House |
| Drake Public Library |
| Dry Run Bridge |
| Dubuque City Hall |
| Dubuque County Courthouse |
| Dubuque County Jail |
| Dubuque Millworking Historic District |
| Dubuque Star Brewery |
| Dubuque YMCA Building |
| Duff Barn |
| Duncan-Duitsman Farm Historic District |
| Duncan, John M., House |
| Dunkerton Bridge |
| Dunleith and Dubuque Bridge |
| Dunn, William and Phebe C., House |
| Dunsmore House |
| Dyas, George, House |
| Dyas Hexagonal Barn |
| Dyas, William, Barn |
| Eagle Grove Public Library |
| Eagle Point Park Historic District |
| Earle & LeBosquet Block |
| Earlham Public School |
| Early, John and Elizabeth McMurn, House |
| East 14th Street Historic District |
| East College Street Historic District |
| East Des Moines Industrial Historic District |
| East Hill House and Carraige House |
| East Indian Creek Bridge |
| East Park Band Shell |
| East Park Historic District |
| Ebeling, Arthur, House |
| Ebeling, Henry, House |
| Eckert House |
| Eckle Round Barn |
| Edinger, Edward, House |
| Edmundson Park Historic District |
| Edwards, Joseph A. and Lydia A., House |
| Edwards-Swayze House |
| Egloff, William C. & Margaret, House |
| Eisenhower Bridge |
| Elbert-Bates House |
| Eldon Carnegie Public Library |
| Eldorado Bridge |
| Eldora Downtown Historic District |
| Eldora Public Library |
| Eldridge, D. C., House |
| Eldridge, Theodore, House |
| Elkader Downtown Historic District |
| Elkader Keystone Bridge |
| Elks-Rogers Hotel |
| Elliott Furniture Company |
| Ellis, Evan F., Farmhouse |
| Ellis, William and Amanda J., Farmstead Historic District |
| Ellsworth-Jones Building |
| Ellsworth-Porter House |
| Ellsworth Ranch Bridge |
| Elmwood-St. Joseph Municipal Cemetery Historic District |
| Ely School House |
| Ely's Stone Bridge |
| Emerson School |
| Emmetsburg Public Library |
| Engineering Hall |
| Englert Theatre |
| Epworth School |
| Equitable Life Insurance Company of Iowa Building |
| Ericson Public Library |
| Estes Park Band Shell |
| Etzel, John L., House |
| Evans Block |
| Evans, Edward B. and Nettie E., House |
| Evans, Henry and Elizabeth Adkinson, House |
| Evans Manufacturing Company Building |
| Eveland Bridge |
| Everist, H. H., House |
| Ewert, Ferdinand, Building |
| Faeth Farmstead and Orchard District |
| Fairfield Public Library |
| Farmers and Merchants Savings Bank |
| Farmers Mutual Reinsurance Company Building |
Data from United States Park Service and Wikidata
