Illinois - Area of significance: Agriculture
| Apple River Fort Site |
| Bassett, Orland P., House |
| Black, Margaret, Farmstead |
| Bruce, James, Round Barn |
| Brunk Farmstead |
| Buckles, Robert, Barn |
| Chicago Board of Trade Building |
| Christenson-Anderson Farm |
| Colby-Petersen Farm |
| Crego, George M., Farm |
| Deere, John, House and Shop |
| Duncan Manor |
| Durham-Perry Farmstead |
| Fairbanks, Morse and Company Building |
| Fehr, Charles, Round Barn |
| Fisher-Chapman Farmstead |
| Frentess, Henry N., Farmstead |
| Garfield Farm and Tavern |
| Gurler, George H., House |
| Harbach, Gerald, Round Barn |
| Hunziker Winery Site |
| Illinois State Fairgrounds |
| Jensen, Chris, Round Barn |
| Kennicott's Grove |
| Kleinkopf, Clarence, Round Barn |
| Knobeloch-Seibert Farm |
| Manske-Niemann Farm |
| McGovney-Yunker Farmstead |
| Mercer County Fairgrounds |
| Milk, Lemuel, Carriage House |
| Miller, Joseph, House |
| Moats, William, Farm |
| Morrow Plots, University of Illinois |
| Mount Lookout |
| Oaklawn Farm |
| Old Stone Gate of Chicago Union Stockyards |
| Otte, Dennis, Round Barn |
| Peotone Mill |
| Power Farmstead |
| Price-Prather House |
| Rainey, Henry T., Farm |
| Ryan Round Barn |
| Scales Mound Historic District |
| Schultz, Raymond, Round Barn |
| Scott, Matthew T., House |
| Sunderlage Farm Smokehouse |
| Taft Farmstead |
| Tallman, Horace M., House |
| Thomas, Lewis H., House |
| Tillery, Virginia, Round Barn |
| Turkey Hill Grange Hall |
| University of Illinois Experimental Dairy Farm Historic District |
| Walnut Grove Farm |
| Weber, Robert, Round Barn |
| Welling-Everly Horse Barn |
| Wheeler-Magnus Round Barn |
| Woodlawn Farm |
Data from United States Park Service and Wikidata
