Delaware - Criteria: A (event)
| Abbott's Mill |
| Aetna Hose, Hook and Ladder Company, Fire Station No. 1 |
| Aiken's Tavern Historic District |
| Air Service, Inc. Hangar at Bellanca Airfield |
| Anderson House |
| Appoquinimink Friends Meetinghouse |
| Ardens Historic District |
| 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 |
| Auburn Mills Historic District |
| Augustine Beach Hotel |
| Augustine Paper Mill |
| Ball Theatre |
| Bancroft and Sons Cotton Mills |
| Bank House |
| Bannister Hall and Baynard House |
| Barnes Woods Archeological District |
| Barratt's Chapel |
| Bartley-Tweed Farm |
| Belleview |
| Bellevue Range Rear Light Station |
| Bethel Historic District |
| Biggs, Gov. Benjamin T., Farm |
| Blackwater Presbyterian Church |
| Bonwell House |
| Brandywine Manufacturers Sunday School |
| Brandywine Park |
| Brandywine Powder Mills District |
| Brandywine Village Historic District |
| Brecknock |
| Brick Hotel |
| Bridgeville Historic District |
| Bridgeville Public Library |
| Brindley Farm |
| Brook Ramble |
| Brown, Dr. John A., House |
| Building 1301, Dover Air Force Base |
| Bullen, John, House |
| Byrd's AME Church |
| Camden Friends Meetinghouse |
| Camden Historic District |
| Cannon's Ferry |
| Carey's Camp Meeting Ground |
| Carney, John, Agricultural Complex |
| Centreville Historic District |
| Chelsea |
| Chipman Potato House |
| Chipman's Mill |
| Choptank |
| Choptank-Upon-The-Hill |
| Christ Church |
| Christ Church |
| Christiana Historic District |
| Clayton Railroad Station |
| Cleaver House |
| Cloud-Reese House |
| Coffee Run Mission Site |
| Collins Potato House |
| Continental Army Encampment Site |
| Cooch's Bridge Historic District |
| Cool Spring Presbyterian Church |
| Cooper House |
| Cornucopia |
| Correll's Farm and Lawn Supply |
| Cow Marsh Old School Baptist Church |
| Curtis Paper Mill Workers' Houses |
| Davis, Robert, Farmhouse |
| Dean, Joseph, & Son Woolen Mill |
| Deep Creek Furnace Site |
| Deer Park Hotel |
| Delaware Academy of Medicine |
| Delaware Boundary Markers |
| Delaware Breakwater and Lewes Harbor |
| Delaware City Historic District |
| Delaware State Museum Buildings |
| De Vries Palisade |
| Dickerson Potato House |
| Dingee, Obadiah, House |
| Dixon, S. P., Farm |
| Dodd Homestead |
| Dover Green Historic District |
| Downtown Wilmington Commercial Historic District |
| Duck Creek Village |
| Dupont, P. S., High School |
| Durham-Shores House |
| East Brandywine Historic District |
| Eastburn, Davis, Farm |
| Eastburn-Jeanes Lime Kilns Historic District |
| Eighth Street Park Historic District |
| Eleutherian Mills |
| Eliason, A., House |
| Elm Grange |
| Eratt House |
| Evans, John, House |
| Exchange Building |
Data from United States Park Service and Wikidata
