Maryland - Significance region: Local
| Coca-Cola Bottling Company of Baltimore Building |
| Cockey-Jamison-Hendrickson House and Store |
| Coffren, John W., House and Store |
| Cold Saturday |
| Coldstream Homestead Montebello Historic District |
| College Heights Estates Historic District |
| Collins, Jackson, House |
| Commercial Credit Company Building |
| Concord |
| Content |
| Content |
| Continental Trust Company Building |
| Cool Hollow Home |
| Corbett Historic District |
| Costen House |
| Cottage, The |
| Coventry Parish Ruins |
| Cover's Tannery |
| Craig, Captain Robert S., Cottage |
| Craighill Channel Lower Range Front Light Station |
| Craighill Channel Lower Range Rear Light Station |
| Cray House |
| Creagh, Patrick, House |
| Creedmore |
| Crisfield Historic District |
| Crockett House |
| Cross Manor |
| Cross Roads Church |
| Crum Road Bridge |
| Cullen Homestead Historic District |
| Cumberland YMCA |
| Curtis-Shipley Farmstead |
| Cut-Off Channel Range Front Light Station |
| Cut-off Channel Range Rear Light Station |
| Dale's Right |
| Darlington Historic District |
| Darnall Place |
| Davidsonville Historic District |
| Davis-Warner House |
| Dawson Farm |
| Deal Island Historic District |
| Decatur Heights Historic District |
| Deer Creek Friends Meetinghouse |
| De La Brooke Tobacco Barn |
| Denton Historic District |
| Dibb House |
| Ditto Knolls |
| Donnelly, Daniel, House |
| Dorchester County Courthouse and Jail |
| Dorguth Memorial United Methodist Church |
| Dorsey Hall |
| Dorsey-Palmer House |
| Douglass, Frederick, High School |
| Douglass Place |
| Douglass Summer House |
| Dowden's Luck |
| Downtown Cumberland Historic District |
| Drane, James, House |
| Drummine Farm |
| Drury-Austin House |
| Dumbarton Historic District |
| Dundalk-Liberty-Cornwall Gardens |
| Early Family Historic District |
| Early, William W., House |
| East Baltimore Historic District, Old |
| East Monument Historic District |
| East Oaks |
| Easton Historic District |
| Edmondson Avenue Historic District |
| Ednor Gardens Historic District |
| Elk Landing |
| Elkridge Furnace Complex |
| Ellerslie |
| Elliot-Bester House |
| Elmwood |
| Emmitsburg Historic District |
| Engine House No. 8 |
| Englar-Scweigart-Rinehart Farm |
| Enniscorthy |
| Equitable Gas Works |
| Erb, Christopher, House |
| Erlanger Buildings |
| Eutaw-Madison Apartment House Historic District |
| Evergreen |
| Evergreen |
| Evergreen House |
| Exchange, The |
| Exeter |
| Eyler, John, Farmstead |
| Fairlee Manor Camp House |
| Fair Meadows |
| Fairmont Heights Historic District |
| Fassitt House |
| Fat Oxen |
| Faust Brothers Building |
| Federal Hill South Historic District |
| Federal Office Building |
| Federal Reserve Bank of Richmond, Baltimore Branch |
| Federalsburg West Historic District |
| Female Seminary |
Data from United States Park Service and Wikidata
