Delaware - Area of significance: Social History
| Aetna Hose, Hook and Ladder Company, Fire Station No. 1 |
| African Union Church and Cemetery of Iron Hill |
| Ardens Historic District |
| Armor, James, House |
| Armstrong Lodge No. 26, A. F. & A. M. |
| Ball Theatre |
| Brandywine Park |
| Bridgeville Public Library |
| Brook Ramble |
| Brown, Dr. John A., House |
| Bullen, John, House |
| Byrd's AME Church |
| Camden Historic District |
| Carey's Camp Meeting Ground |
| Centreville Historic District |
| Christ Church |
| Cloud-Reese House |
| Cool Spring Presbyterian Church |
| Cooper House |
| Coursey, Thomas B., House |
| Curtis Paper Mill Workers' Houses |
| Dauneport House |
| Deer Park Hotel |
| Delaware Academy of Medicine |
| Dingee, Obadiah, House |
| Dover Green Historic District |
| Duck Creek Village |
| Eighth Street Park Historic District |
| Exchange Building |
| Fell Historic District |
| Friends Meetinghouse |
| Grace United Methodist Church |
| Great Geneva |
| Green Meadow |
| Griffith's Chapel |
| Hanson, B. F., House |
| Hill Island Farm |
| Holladay-Harrington House |
| Howard High School |
| Johnson-Morris House |
| Killgore Hall |
| Kingswood Methodist Episcopal Church |
| La Grange |
| Laurel Historic District |
| Lewden, John, House |
| Lobdell Estate, Minquadale Home |
| Middletown Historic District |
| Moore House |
| Mount Lebanon Methodist Episcopal Church |
| Mount Pleasant |
| New Century Club |
| Newport Railroad Station |
| Noxontown |
| Old Bridgeville Fire House |
| Old Fire House |
| Old Fort Church |
| Old St. Anne's Church |
| Old Sussex County Courthouse |
| Ott's Chapel |
| Owl's Nest Country Place |
| Palmer Home |
| Prospect A.M.E. Church |
| Public School No. 111-C |
| Public School No. 29 |
| Quaker Hill Historic District |
| Raymond Neck Historic District |
| Riverview Cemetery Company of Wilmington, Delaware |
| Rockford Park |
| Rockwood |
| Savin-Wilson House |
| Springer-Cranston House |
| St. Anthony's Roman Catholic Church |
| Star Hill AME Church |
| STATE OF PENNSYLVANIA (steamboat) |
| Steel, James, House |
| St. Joseph's on the Brandywine |
| St. Nicholas Ukrainian Catholic Church |
| Strand Millas and Rock Spring |
| Sutton, Thomas, House |
| Tharp House |
| Thomas, David W., House |
| Union Wesley Methodist Episcopal Church Complex |
| Vandyke-Heath House |
| Vincelette Futuro House |
| Water Witch Steam Fire Engine Company No. 5 |
| Wilmington YMCA |
| Windsor |
| Woman's Christian Temperance Union Fountain |
| Woman's Club of Newport |
| Young, William, House |
| Zion African Methodist Episcopal Church |
Data from United States Park Service and Wikidata
