Delaware - Area of significance: Agriculture
| Abbott's Mill |
| Achmester |
| Armstrong, A., Farm |
| Armstrong-Walker House |
| Arnold, George, House |
| Attix, Thomas, House |
| Bannister Hall and Baynard House |
| Bartley-Tweed Farm |
| Belleview |
| Biggs, Gov. Benjamin T., Farm |
| Bloomfield |
| Brecknock |
| Brindley Farm |
| Buena Vista |
| Carney, John, Agricultural Complex |
| Chelsea |
| Chipman Potato House |
| Choptank |
| Choptank-Upon-The-Hill |
| Cleaver House |
| Cochran Grange |
| Collins Potato House |
| Cornucopia |
| Correll's Farm and Lawn Supply |
| Cox-Phillips-Mitchell Agricultural Complex |
| Davis, Robert, Farmhouse |
| Dickerson Potato House |
| Dixon, S. P., Farm |
| Dodd Homestead |
| Durham-Shores House |
| Eastburn, Davis, Farm |
| Egglinton Hall |
| Eliason, A., House |
| Elm Grange |
| Fairview |
| Fairview |
| Fields Heirs |
| First Broiler House |
| Fleming House |
| Gordon, J. M., House |
| Grantham-Edwards-McComb House |
| Grose, Robert, House |
| Hazel Glen |
| Hearn Potato House |
| Hersey-Duncan House |
| Higgins, S., Farm |
| Hitch, E. L., Potato House |
| Hitchens, Ames, Chicken Farm |
| Holton, S., Farm |
| Homestead Hall |
| Hopkins' Covered Bridge Farm |
| Idalia Manor |
| Kenton Historic District |
| La Grange |
| Lewis Family Tenant Agricultural Complex |
| Lindale,John B.,House |
| Linden Hill |
| Lindsay, J., Barn |
| Little Creek Hundred Rural Historic District |
| Lombardy Hall |
| MacDonough, Comdr. Thomas, House |
| Maple Grove Farm |
| Mason, J., Farm |
| Mayfield |
| McCormack, J., Farm |
| McDaniel, J., Farm |
| McIntyre, J., Farm |
| McWhorter House |
| Middletown Historic District |
| Misty Vale |
| Mondamon Farm |
| Monterey |
| Moore Potato House |
| Morgan, William, Farm |
| Okolona |
| Old Brick Store |
| Old Cann Mansion House |
| Old Ford Dairy |
| Penn Farm of the Trustees of the New Castle Common |
| Pepper, Carlton, David, Farm |
| Peterson and Mustard's Hermitage Farm |
| Phillips Potato House |
| Pierson, T., Farm |
| Point Farm |
| Poplar Hall |
| Ralph Potato House |
| Reed, Jehu, House |
| Retirement Farm |
| Richards Historic District |
| Rider Potato House |
| Riverdale |
| Rosedale |
| Ross, Gov. William H., House |
| Rumsey Farm |
| Shallcross, Sereck, House |
| Springer Farm |
| Stanley Potato House |
| Stewart, James, House |
| Stinson, J., Farm |
| Sudler House |
Data from United States Park Service and Wikidata
