All - Architectural style - Chicago School
| Ford Motor Company Cincinnati Plant |
| Frauenthal & Schwarz Building |
| Gibson Company Building |
| Goldblatt Bros. Department Store |
| Goodspeed Brothers Building |
| Goodyear Tire and Rubber Company Building and B.F. Goodrich Building |
| Gottschalk, Fred, Grocery Store |
| Grapevine Commercial Historic District (Boundary Increase II) |
| Great Northern Freight Warehouse |
| Gruninger, W. A., Building |
| Gulf Oil Distribution Facility |
| Hamer's General Store |
| Harlan Building |
| Heard Building |
| Heilbronner Block |
| Hemenway Furniture Co. Building |
| Hennen Building |
| Henry, C. K., Building |
| Highland Building |
| Highway Garage |
| Hill, W. L., Store |
| Hippee Building |
| Hoff Department Store |
| Hotel Brigham |
| Hotel Iowa |
| Hotel Lester-Lester Cafe |
| Hotel Paso del Norte |
| Hotel Randolph |
| Hotel Redmont |
| Hotel Texas (Boundary Increase) |
| Hotel Washington |
| Hotel Whitney |
| Hubbell Building |
| Hughes Brothers Manufacturing Company Building |
| Huntington Building |
| Ideal Department Store Building |
| Imperial Hotel |
| Imperial Hotel |
| Industrial Building |
| Insurance Building-Consumers Cooperative Association Building |
| Interior Telephone Company Building |
| Inter-State Building |
| Interstate Forwarding Company Warehouse |
| Iowana Hotel |
| Jacala Restaurant |
| Jefferson County Jail |
| J. M. S. Building |
| Journal-Gazette Building |
| Kahl Building |
| Keeler Building |
| Kennedy Building |
| Kenyon's Department Store |
| King, L. B. and Co. Building |
| Knights of Pythias Lodge |
| Knight, W.A., Building |
| Krause Building-Otto Moser's Cafe |
| Kress Building |
| Kress, S.H., and Company Building |
| Kunkel Building |
| Lamp, Robert M., House |
| Land Title Building |
| LaSalle Hotel |
| Lassen Hotel |
| Lawyers Building |
| Lewis, A. T., New Building |
| Lexington Dry Goods Company Building |
| Liberty Building |
| Liberty Theater |
| Liebes, H. and Company, Building |
| Life Savers Building |
| Lillie, Frank R., House |
| Lincoln Building |
| Lincoln Liberty Life Insurance Building |
| Lincoln Paint and Color Company Building |
| Lindsey Building |
| Lipman-Wolfe and Company Building |
| Locke Block |
| Longmont Fire Department |
| Louisville Trust Building |
| Ludington Building |
| Lynch Building |
| Lyon Building |
| Macheca Building |
| Mahoning National Bank Building |
| Main and Military Plazas Historic District |
| Main Street/Market Square Historic District |
| Manhattan Building |
| Manhattan Building |
| Marine Commercial Historic District |
| Marott's Shoes Building |
| Marquette Apartments |
| Marquette Building |
| Marshall Field Company Store |
| Marsh, George B., Building |
| Martin Building |
| Martin Hotel |
| Masonic Temple |
| May Company |
| McClurg Building |
| McIntosh Building |
Data from United States Park Service and Wikidata
