Delaware - Significance region: Local
| 901 Mt. Lebanon Rd. |
| Adams, Joseph T., House |
| Aetna Hose, Hook and Ladder Company, Fire Station No. 1 |
| Aetna Hose, Hook and Ladder Company Fire Station No. 2 |
| African Union Church and Cemetery of Iron Hill |
| Aiken's Tavern Historic District |
| Allen, Charles, House |
| All Saints' Episcopal Church |
| American Vulcanized Fibre Company-Wilmington Plant |
| Amstel House |
| Anderson House |
| Armor, James, House |
| Armstrong, A., Farm |
| Armstrong Lodge No. 26, A. F. & A. M. |
| Armstrong-Walker House |
| Arnold, George, House |
| Ashland Bridge |
| Ashton Historic District |
| Attix, Thomas, House |
| Augustine Beach Hotel |
| Avery's Rest Site |
| Baily House |
| Ball Theatre |
| Baltimore Mills Historic Archaeological Site |
| Bank House |
| Bank of Newark Building |
| Bannister Hall and Baynard House |
| Barratt Hall |
| Bartley-Tweed Farm |
| Baynard Boulevard Historic District |
| Belleview |
| Bellevue Range Rear Light Station |
| Bell Farmhouse |
| Belmont Hall |
| Bethel Historic District |
| Bethel Methodist Protestant Church |
| Betz, J. F., House |
| Biddle House |
| Blackiston, Benjamin, House |
| Blackwater Presbyterian Church |
| Blue Hen Farm |
| Bonwell House |
| Brandywine Manufacturers Sunday School |
| Brandywine Park |
| Braunstein's Building |
| Brick Hotel |
| Bridgeville Public Library |
| Brook Ramble |
| Brown, Dr. John A., House |
| Budovitch, Florence and Isaac, House |
| Building 1301, Dover Air Force Base |
| Building at 140 W. Main Street |
| Building at 200-202A High Street |
| Building at 218 High Street |
| Building at 28-34 1/2 Academy Street |
| Building at 34 Choate Street |
| Building at High and Cannon Streets |
| Bullen, John, House |
| Burrows, W. D., House |
| Burton-Blackstone-Carey Store |
| Byrd's AME Church |
| Camden Friends Meetinghouse |
| Carpenter-Lippincott House |
| Centreville Historic District |
| Chambers House |
| Chambers House |
| Chandler, Joseph, House |
| Cherbourg Round Barn |
| Chipman Potato House |
| Chipman's Mill |
| Choptank |
| Choptank-Upon-The-Hill |
| Christ Church |
| Church Street Historic District |
| Clark-Pratt House |
| Clayton Railroad Station |
| Cleaver House |
| Cloud, Abner, House |
| Cloud-Reese House |
| Coleman House |
| Collins Potato House |
| Collison House |
| Compton Park Apartments |
| Cool Spring Park Historic District |
| Cool Spring Presbyterian Church |
| Cooper House |
| Cornucopia |
| Coursey, Thomas B., House |
| Cox, J. W., Dry Goods Store |
| Cox-Phillips-Mitchell Agricultural Complex |
| Crosby and Hill Building |
| Cummins, David J., House |
| Cummins, Timothy, House |
| Curtis Mansion |
| Curtis Paper Mill Workers' Houses |
| Dauneport House |
| Davis, Thomas, House |
| Deep Creek Furnace Site |
| Deer Park Farm |
| Deer Park Hotel |
Data from United States Park Service and Wikidata
