Iowa - Role: Building
| Decorah Woolen Mill |
| Deering, Nathaniel Cobb and Lucetia Baily, House |
| DeFries House, Barn and Carpenter Shop |
| Delaware County Courthouse |
| Delmar Calaboose |
| Delta Upsilon Chapter House |
| Democrat Building |
| Denison Opera House |
| Denmark Congregational Church |
| Denny, Professor Charles O., House |
| Des Moines Art Center |
| Des Moines Building |
| Des Moines County Court House |
| Des Moines Fire Department Headquarters-Fire Station No. 1 and Shop Building |
| Des Moines Saddlery Company Building |
| Des Moines Township #7 |
| Des Moines Western Railway Freight House |
| Dessaint, Marie Clare, House |
| Dexter Community House |
| Diamond Jo Boat Store and Office |
| Dibble House |
| Dick’s Diner |
| Dierks, Peter, House |
| Dils-Downer House |
| Dobbin Round Barn |
| Dodd, A. B. C., House |
| Dodge, Augustus Caesar, House |
| Dodge, Grenville M., House |
| Dolliver Memorial State Park, Entrance Area (Area A) |
| Dominy, John S., House |
| Donahue Building |
| Douglas, George B., House |
| Dow House |
| Downey Savings Bank |
| Downey School |
| Drake, John and Amanda Bigler, House |
| Drake Public Library |
| Dr. Salsbury's Laboratories, Main Office and Production Laboratory Building |
| Dubuque Casket Company |
| Dubuque City Hall |
| Dubuque County Courthouse |
| Dubuque County Jail |
| Dubuque Freight House |
| Dubuque Star Brewery |
| Dubuque YMCA Building |
| Duff Barn |
| Dugan's Saloon |
| Duncan, John M., House |
| Dunham, Z. T., Pioneer Stock Farm |
| Dunn, William and Phebe C., House |
| Dunsmore House |
| Dyas, George, House |
| Dyas Hexagonal Barn |
| Dyas, William, Barn |
| Eagle Grove Public Library |
| Earle & LeBosquet Block |
| Earlham Public School |
| Early, John and Elizabeth McMurn, House |
| East Amsterdam School |
| East Hill House and Carraige House |
| East Junior High School |
| Ebeling, Arthur, House |
| Ebeling, Henry, House |
| Eckert House |
| Eckle Round Barn |
| Economy Advertising Company |
| Edel, Matthew, Blacksmith Shop and House |
| Edgewood School of Domestic Arts |
| Edinger, Edward, House |
| Edwards, Joseph A. and Lydia A., House |
| Edwards-Swayze House |
| Egloff, William C. & Margaret, House |
| Elbert-Bates House |
| Eldon Carnegie Public Library |
| Eldora Public Library |
| Eldridge, D. C., House |
| Eldridge, Theodore, House |
| Elgin Block, The |
| Elkader Opera House |
| Elks-Rogers Hotel |
| Elliott Furniture Company |
| Ellis, Evan F., Farmhouse |
| Ellsworth-Jones Building |
| Ellsworth-Porter House |
| Elmwood, The- The Oaks-The Birches |
| Ely School House |
| Emerson Hough Elementary School |
| 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 |
Data from United States Park Service and Wikidata
