| Campbell Soup | Salisbury | MD |
| Cancer Research Center | Baltimore | MD |
| Canton | Baltimore | MD |
| Canton Box | Baltimore | MD |
| Canton Railroad | Baltimore | MD |
| Cape Venetico | Baltimore | MD |
| Cardinal Gibbons School | Baltimore | MD |
| Carling Brewing | Baltimore | MD |
| Carl Thusgaard | Baltimore | MD |
| Carlyle Apartments | Baltimore | MD |
| Carr Lowery Glass | Baltimore | MD |
| Carr Office Building | Salisbury | MD |
| Carrollan Manor Apartments | Hyattsville | MD |
| Carroll County General Hospital | Westminster | MD |
| Carroll Island Power Plant | Baltimore | MD |
| Carson Ceilings & Walls | Baltimore | MD |
| Carvel Hall Hotel | Annapolis | MD |
| Carver Vocatioal Technical Hig | Baltimore | MD |
| Caso Standard Oil | Baltimore | MD |
| Cathedral Of Mary Our Queen | Baltimore | MD |
| Catonsville Library | Catonsville | MD |
| C. & D. Telephone | Cockeysville | MD |
| Cecil County Commissioners | Elkton | MD |
| Cecil Paper | Elkton | MD |
| Celanese | Luke | MD |
| Celanese | Cumberland | MD |
| Celanese | Amcelle | MD |
| Celanese | Baltimore | MD |
| Census Bureau | Suitland | MD |
| Centeral Falls Victory | Baltimore | MD |
| Centerville Post Office | Salisbury | MD |
| Central District Police Station | Baltimore | MD |
| Central Lab & Office Building | Baltimore | MD |
| Chalk Point Power Plant | Aquasco | MD |
| Charles Center | Baltimore | MD |
| Charles L. Carter Cecil Mills | Singerly | MD |
| Charles M. Schwab | Baltimore | MD |
| Charles Scribner | Baltimore | MD |
| Cheelee | Baltimore | MD |
| Chemetron Chemicals | Elkton | MD |
| Cherry Hill Housing | Baltimore | MD |
| Cherry Hill Middle School | Elkton | MD |
| Chesapeake & Ohio Railroad | Baltimore | MD |
| Chesapeake Paper Board | Baltimore | MD |
| Chestnut Hill Apartments | Temple Hills | MD |
| Chevrolet | Baltimore | MD |
| Chevron | Baltimore | MD |
| Chevy Chase Elementary School | Chevy Chase | MD |
| Children's Center | Baltimore | MD |
| Chilore | Sparrows Point | MD |
