Delaware - Area of significance: Politics/Government
| Belmont Hall |
| Biggs, Gov. Benjamin T., Farm |
| Broom, Jacob, House |
| Buena Vista |
| Cheyney Clow's Rebellion, Scene of |
| Clearfield Farm |
| Delaware Boundary Markers |
| Delaware State Museum Buildings |
| Dickinson, John, House |
| Dover Green Historic District |
| Eden Hill |
| Egglinton Hall |
| Fisher's Paradise |
| Hall, Col. David, House |
| Hart House |
| Hazzard House |
| Hermitage, The |
| Ivy Dale Farm |
| Judge's House and Law Office |
| Lewes Historic District |
| Liston House |
| Lombardy Hall |
| Lower St. Jones Neck Historic District |
| Macomb Farm |
| McColley, James, House |
| McLane, Louis, House |
| Mermaid Tavern |
| Middletown Historic District |
| New Castle County Court House |
| New Castle Historic District |
| Old Statehouse |
| Old Sussex County Courthouse |
| Old Town Hall |
| Penn Farm of the Trustees of the New Castle Common |
| Ponder, Gov. James, House |
| Robinson, Jesse, House |
| Ross, Gov. William H., House |
| Snowland |
| Somerville |
| Spring Banke |
| Stonum |
| Sussex County Courthouse and the Circle |
| Tharp House |
| Truitt, Gov. George, House |
| Tyn Head Court |
| Victorian Dover Historic District |
| Village of Arden |
| Water Witch Steam Fire Engine Company No. 5 |
| Wheel of Fortune |
| Woodward Houses |
Data from United States Park Service and Wikidata
