Pennsylvania - Area of significance: Architecture
| Crozer, George K., Mansion |
| Crozer, John P., II, Mansion |
| Culbertson-Harbison Farm |
| Cumberland Valley State Normal School Historic District |
| Cuppett's Covered Bridge |
| Curtis Arboretum |
| Cuttalossa Valley Historic District |
| Dager-Wonsettler Farmstead |
| Dale, Felix, Stone House |
| Dale Furnace and Forge Historic District |
| Dale, Samuel F., House |
| Damascus Historic District |
| Danville Historic District |
| Danville West Market Street Historic District |
| Darby Meeting |
| Darrah, Lydia, School |
| Dauphin County Courthouse |
| Davies, Edward, House |
| Davies House |
| Davis, Daniel, House and Barn |
| Davis, David, Farm |
| Dawesfield |
| Dawson Historic District |
| Deery Family Homestead |
| Defibaugh Tavern |
| DeHaven, Harry, House |
| Deisher, H. K., Knitting Mill |
| Delaware County National Bank |
| Delaware, Lackawanna and Western Railroad Station |
| Delaware, Lackawanna and Western Railroad Water Gap Staion |
| Delaware Station of the Philadelphia Electric Company, The |
| Delmar Apartments |
| Delta Historic District |
| Denison House |
| Dent Hardware Company Factory Complex |
| Derrow, Margaret, House |
| Deshler-Morris House |
| Deutschtown Historic District |
| D & H Canal Co. Office |
| Diamond Silk Mill |
| Dick Building |
| Dickson Works |
| Diehl, George, Homestead |
| Diehls Covered Bridge |
| Dillingersville Union School and Church |
| Dill's Tavern |
| Dilworth Elementary School |
| Dilworthtown Historic District |
| Dime Bank Building |
| Dimeling Hotel |
| Dime Savings and Trust Company |
| Dingman's Ferry Dutch Reformed Church |
| Disston, Hamilton, School |
| Disston, Mary, School |
| Doak-Little House |
| Dobbin House |
| Dobbins, Murrell, Vocational School |
| Dobson, James, School |
| Dobson Mills |
| Dohner, Michael, Farmhouse |
| Dolington Village Historic District |
| Dollar Savings Bank |
| Donaldson, Widow, Place |
| Donaldson, William, House |
| Donegal Mills Plantation |
| Dorflinger, Eugene, Estate |
| Dorneyville Crossroad Settlement |
| Dorrance Mansion |
| Dorsey, Joseph, House |
| Dougherty, Edward, House |
| Douglas, John S., House |
| Douglass, George, House |
| Douglass, John, House |
| Downer Tavern |
| Downing, Hunt, House |
| Downingtown Log House |
| Downtown Altoona Historic District |
| Downtown Indiana Historic District |
| Downtown Johnstown Historic District |
| Doylestown Historic District |
| Drake Hotel |
| Drake Log Cabin |
| Dreibelbis, Joel, Farm |
| Dreibelbis Mill |
| Drexel and Company Building |
| Drexel Development Historic District |
| Drexel, Francis M., School |
| Drinker's Court |
| Dritt Mansion |
| Dropsie University Complex |
| Druim Moir Historic District |
| Dubois Historic District |
| Dunbar-Creigh House |
| Dunbar, Paul Lawrence, School |
| Dungan, Pugh, House |
| Dunlap, Thomas, School |
| Dunlap, William B., Mansion |
| Durham, Thomas, School |
| Dusmal House |
| Dyerstown Historic District |
Data from United States Park Service and Wikidata
