Maryland - Role: Building
| Choate House |
| Christ Church |
| Christ Church |
| Christ Church |
| Christ Church, Graveyard and Sexton's House |
| Christ Church Guilford |
| Christ Episcopal Church |
| Christ Episcopal Church and Cemetery |
| Churchill Threatre-Community Building |
| Churchman, John, House |
| Church of the Holy Trinity |
| Churchville Presbyterian Church |
| Citizens State Bank |
| City Hall |
| Clagett House at Cool Spring Manor |
| Clagett, Robert, Farm |
| Clara Barton National Historic Site |
| Clarke, Littleton T., House |
| Clarksburg School |
| Clark's Conveniency |
| Clay's Hope |
| Clemson, Joanna & Dennis D. H., Farm |
| Clifton |
| Clifton School |
| Cloisters, The |
| Clover Hill |
| Coca-Cola Baltimore Branch Factory |
| Coca-Cola Bottling Company of Baltimore Building |
| Cockey-Jamison-Hendrickson House and Store |
| Coffren, John W., House and Store |
| Cold Saturday |
| Coleman, Robert W., School |
| College of Medicine of Maryland |
| Collins, Jackson, House |
| Colonial Theatre |
| Colora Meetinghouse |
| Commercial Credit Company Building |
| Compton |
| Compton Bassett |
| Concord |
| Content |
| Content |
| Continental Trust Company Building |
| Cool Hollow Home |
| Cornehill |
| Costen House |
| Cottage, The |
| Cover's Tannery |
| Craig, Captain Robert S., Cottage |
| Cray House |
| Creagh, Patrick, House |
| Creedmore |
| Cresap, Michael, House |
| Crisfield Armory |
| Crockett House |
| Crooked Intention |
| Cross Manor |
| Cross Roads Church |
| Cullen, Victor, Center, Old Administration Building |
| Cullen, Victor, School Power House |
| Cumberland YMCA |
| Cummins Memorial Church |
| Curtis-Shipley Farmstead |
| Daffin House |
| Dale's Right |
| Darnall Place |
| Davidge Hall, University of Maryland |
| Davis-Warner House |
| Dawson Farm |
| Deep Falls |
| Deer Creek Friends Meetinghouse |
| De La Brooke Tobacco Barn |
| Denton Armory |
| Denton House |
| D. H. Springhouse |
| Dibb House |
| Ditto Knolls |
| Donnelly, Daniel, House |
| Dorchester County Courthouse and Jail |
| Dorguth Memorial United Methodist Church |
| Dorsey Hall |
| Dorsey-Palmer House |
| Doub Farm |
| Doughoregan Manor |
| Douglass, Frederick, High School |
| Douglass Place |
| Douglass Summer House |
| Dowden's Luck |
| Drane, James, House |
| Drummine Farm |
| Drury-Austin House |
| Dudley's Chapel |
| Dundalk-Liberty-Cornwall Gardens |
| Eagle's Nest |
| Early, William W., House |
| Eastern Female High School |
| Eastern High School |
| East Nottingham Friends Meetinghouse |
| Elk Landing |
| Elkridge Furnace Complex |
Data from United States Park Service and Wikidata
