Wisconsin - Criteria: C (architecture/engineering)
| Hyde Chapel |
| Hyer's Hotel |
| Ihm House |
| Immanuel Presbyterian Church |
| Ingalsbe, Adolphus and Sarah, House |
| Ingebretson, Gaute, Loft House |
| Iowa County Courthouse |
| Iowa Street Historic District |
| Iron Block |
| Isermann, Anthony and Caroline, House |
| Isermann, Frank and Jane, House |
| Island of Happy Days |
| Island Woolen Company Office Building |
| Iverson-Johnson House |
| Jabodon |
| Jackman Building |
| Jacobs, Herbert and Katherine, First House |
| Jacobs, Herbert and Katherine, Second House |
| Jahn, William F., Farmstead |
| Jefferson Avenue Historic District |
| Jefferson Fire Station |
| Jefferson High School |
| Jefferson Public Library |
| Jenifer-Spaight Historic District |
| Jennings, Ellis, House |
| Jensen, Tollef, House |
| Jensvold, Gulbrand and Bertha, House |
| Jischke's Meat Market |
| Johnson, A.P., House |
| Johnson, Herbert F., House |
| Johnson, S.C., and Son Administration Building and Research Tower |
| Johnston Hall |
| Jones, David J. and Maggie, House |
| Jones, Fred B., Estate |
| Jones, Granville D., House |
| Jones, John A. and Maggie, House |
| Jones, John H., House |
| Jones, Robert O., House |
| Jones, Samuel S., Cobblestone House |
| Jump River Town Hall |
| Jung Shoe Manufacturing Company Factory |
| Kaiser's |
| Kaukauna Locks Historic District |
| Kayser, Adolph H., House |
| Kellogg Public Library and Neville Public Museum |
| Kemper Hall |
| Kemp, John and Margarethe, Cabin |
| Kenosha County Courthouse and Jail |
| Kenosha North Pierhead Light |
| Kerwin, Judge J. C., House |
| Ketchum, Daniel and Caltherine, Cobblestone House |
| Kewaunee County Sheriff's Residence and Jail |
| Kewaunee Post Office |
| Kilbourn Masonic Temple |
| Kilbourn Public Library |
| Kinney, Patrick and Margaret, House |
| Kinnickinnic Church |
| Kittleson House |
| Klein Dairy Farmhouse |
| Kliese Housebarn |
| Kneeland-Walker House |
| Knickerbocker Hotel |
| Kohler, John Michael, House |
| Kohlmann, Friederich, House |
| Krause, Daniel E., Stone Barn |
| Kuehn Blacksmith Shop-Hardware Store |
| Kuhl, Christina, House |
| Kurth, John H., and Company Office Building |
| LaCrosse Commercial Historic District |
| La Crosse County School of Agriculture and Domestic Economy |
| Lafayette County Courthouse |
| Lake Park |
| Lake View Sanatorium |
| Lamb Building |
| Lamp, Robert M., House |
| Lancaster Municipal Building |
| Lancaster Post Office |
| Langdon Street Historic District |
| Langlade County Courthouse |
| La Pointe Light Station |
| Lappin-Hayes Block |
| Larson, August Cornelius, House |
| Larson Brothers Airport |
| Larson, L. A., & Co. Store |
| Lathrop Hall |
| Lathrop-Munn Cobblestone House |
| Laue, Frederick, House |
| Laue, Frederick, Jr., House |
| Lauerman Brothers Department Store |
| Lawson Airplane Company-Continental Faience and Tile Company |
| Lawton, C. A., Company |
| Leitch, William T., House |
| Lena Road School |
| Lewis, Frank T. and Polly, House |
| Lewis, Gov. James T., House |
| Lewis-Williams House |
| Library Park |
| Library Park |
| Library Park Historic District |
| Lidice Memorial |
Data from United States Park Service and Wikidata
