Ohio - Area of significance: Architecture
| Delaware Public Library |
| Delco Building |
| Demand-Gest House |
| Deming, Col. Simeon, House |
| Denison, William, House |
| Dennison High School |
| Denzel, John, House |
| Derby, H. W., Building |
| Detmer, A. M., House |
| Detroit-Warren Building |
| Detwiller, John, Tavern and Farmstead |
| Deuscher, Henry P., House |
| Dewalt Building |
| Dew House |
| Dewitt, Zachariah Price, Cabin |
| DeYarmon, Joseph L. House |
| Diamond Historic District |
| Diamond Match Historic District |
| Dickey, Moses and Margaret, House |
| Dilger Store |
| Disciple-Christian Church |
| Diver, John, House and Storebuilding |
| Division Avenue Pumping Station |
| Dixon-Globe Opera House-Robinson-Schwenn Building |
| Dixon Hall Apartments |
| Doan House |
| Doan School |
| Dobkins, John and Syd, House |
| Doctors' Building |
| Doerzbach, George J., House |
| Dole-Darrell House |
| Dombar, Benjamin, House and Studio |
| Domestic Arts Hall And Flower Hall |
| Domhoff Buildings |
| Dorsey Building |
| Douglas, S.M., House |
| Dovel-Bowers House |
| Dovel, J. H., Farm |
| Dow House |
| Downing, John, Jr., House |
| Downtown Bellefontaine Historic District |
| Downtown Dayton Historic District |
| Downtown Ironton Historic District |
| Downtown Mansfield Historic District |
| Downtown Mount Vernon Historic District |
| Downtown Oberlin Historic District |
| Downtown Painesville Historic District |
| Downtown Sandusky Commercial Historic District |
| Downtown Tiffin Historic District |
| Downtown Van Wert Historic District |
| Downtown Willoughy Historic District |
| Downtown Xenia Historic District |
| Downtown Zanesville Historic District |
| Drake, Alonzo, House |
| Drake, Elam, House |
| Drexel Theater |
| Drill Hall-Boys’ Industrial School |
| Droppers, Carl, House |
| Duane Block |
| Dublin Cemetery Vaults |
| Dublin Christian Church |
| Dublin Christian Church |
| Dublin High Street Historic District |
| Dublin Veterinary Clinic |
| Duffy, Michael, Farm |
| Dunbar Historic District |
| Duncan, Robert P., House |
| Duncarrick |
| Dunham, Hezekiah, House |
| Dunham Tavern |
| Dun, John, Homestead |
| Dunlap-Burnett-Moss House |
| Dunlap, William K., House |
| Dunton House |
| Dustin Cabin |
| Duttenhofer Building |
| Dye, John Minor, Stone House |
| Eager Inn |
| Eagle Point Colony Historic District |
| Eagles Building |
| Eagles Building |
| Eagles Building-Strand Theater |
| Eagles Temple |
| Ealy, George and Christina, House |
| Earley-Hartzell House |
| Early Greek Revival Cottage |
| Early Greek Revival House |
| East 89th Street Historic District |
| East Boulevard Historic District |
| East Broad Street Commercial Building |
| East Broad Street Historic District |
| East Broad Street Presbyterian Church |
| East Cleveland District 9 School |
| East End Historic District |
| Eastern Hills Young Men's Christian Association (YMCA) |
| East Fifth Street Historic District |
| East Fourth Street Historic District |
| East Fourth Street Historic District |
| East Gambier Street District |
| East High Street District |
Data from United States Park Service and Wikidata
