| Courts Of Appeal Building | Annapolis | MD |
| C. & P. Telephone | Baltimore | MD |
| Crane Generating Station | Baltimore | MD |
| Cresap Hall | Reisterstown | MD |
| Croker & Stallings | Baltimore | MD |
| Crook Kries | Baltimore | MD |
| Crosby S. Noyes | Baltimore | MD |
| Crosse & Blackwell | Baltimore | MD |
| Cross Keys | Baltimore | MD |
| Crown Cork & Seal | Baltimore | MD |
| Crownsville Hospital Center | Crownsville | MD |
| Cubore | Sparrows Point | MD |
| Cumberland Brewing | Cumberland | MD |
| Curtis Bay Copper & Iron Works | Baltimore | MD |
| Curtis Bay Distillery | Baltimore | MD |
| Curtis Bay Pigment Plant | Baltimore | MD |
| Curtis Bay Shipyard | Baltimore | MD |
| Curtis Bay Works | Baltimore | MD |
| Daniel Chester French | Baltimore | MD |
| Dart Drug Headquarters | Landover | MD |
| Data Processing Center | Cockeysville | MD |
| David De Vries | Baltimore | MD |
| David Taylor Model Basin | Bethesda | MD |
| Davison Chemical | Baltimore | MD |
| Days Inn | Baltimore | MD |
| Dc Government | Glenn Dale | MD |
| Deep Creek Middle School | Baltimore | MD |
| Delmarva Power & Light | Vienna | MD |
| Deluro | Baltimore | MD |
| Department Of Power & Water | Towson | MD |
| Department Of Public Welfare | Baltimore | MD |
| Department Of Social Services | Baltimore | MD |
| Diamond Shamrock | Baltimore | MD |
| Diamond Shamrock | Edgewood | MD |
| Dickerson Power Plant | Frederick | MD |
| Dickerson Power Plant | Dickerson | MD |
| Digester Building | Luke | MD |
| Diplomat Apts | Baltimore | MD |
| District Training School | Laurel | MD |
| Domingo De Larrinaga | Baltimore | MD |
| Domino Sugar | Baltimore | MD |
| Dorchester County Courthouse | Cambridge | MD |
| Dorothy | Baltimore | MD |
| Doubletree Hotel | Bethesda | MD |
| Dragon Cement | Baltimore | MD |
| Dual Lane Bowling Center | Hagerstown | MD |
| Dulaney High School | Timonium | MD |
| Dunbar High School | Baltimore | MD |
| Dundalk High School | Baltimore | MD |
| Dundalk Marine Terminal | Dundalk | MD |
