Wisconsin - Area of significance: Architecture
| Kenwood Park-Prospect Hill Historic District |
| Kenyon, A. L., House |
| Kerwin, Judge J. C., House |
| Ketchum, Daniel and Caltherine, Cobblestone House |
| Ketter, Frederick, Warehouse |
| Kewaunee County Sheriff's Residence and Jail |
| Kewaunee Pierhead Lighthouse |
| Kilbourn Avenue Row House Historic District |
| Kilbourn Masonic Temple |
| Kilbourn Public Library |
| Kimball, Alanson M., House |
| King Street Arcade |
| Kinney Farmstead-Tay-e-he-Dah Site |
| Kinney, Patrick and Margaret, House |
| Kinnickinnic Church |
| Kittleson House |
| Klein Dairy Farmhouse |
| Kliese Housebarn |
| Kline's Department Store |
| Klingholz, Charles and Herriette, House |
| Klueter and Company Wholesale Grocery Warehouse |
| Knapp-Astor House |
| Knapp-Calkins Farmstead |
| Kneeland-Walker House |
| Knickerbocker Hotel |
| Koch, Carl, Block |
| Koeffler-Baumgarten Double House |
| Koehler, Frank, House and Office |
| Koelsch Funeral Home |
| Koepsel House |
| Kohl, Edward F. and Jean, House |
| Kohler Company Factory Complex |
| Kohler, John Michael, House |
| Kohlmann, Friederich, House |
| Kohl's Food Store |
| Krause, Daniel E., Stone Barn |
| Kriesel, Louis C. and Augusta, Farmstead |
| Kronser, Joseph, Hotel and Saloon |
| 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 |
| Laflin Avenue Historic District |
| Lain-Estburg House |
| Lake Mills Downtown Commercial Historic District |
| Lake Nebagamon Auditorium |
| Lake Street Historic District |
| Lake View Sanatorium |
| Lamb Building |
| Lamp, Robert M., House |
| Lancaster Municipal Building |
| Langdon Street Historic District |
| Langlade County Courthouse |
| 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 |
| Lauerman, F.J., House |
| Laverty-Martindale House |
| Lawson Airplane Company-Continental Faience and Tile Company |
| Lawton, C. A., Company |
| Leitch, William T., House |
| Lena Road School |
| Lenfestey, Agnes and Ruth Lenfestey Mark, House |
| Leonard-Leota Park |
| Lewis Farmhouse |
| Lewis, Frank T. and Polly, House |
| Lewis, Gov. James T., House |
| Lewis-Williams House |
| Library Park Historic District |
| Lie, Aslak, Cabin |
| Lincoln Boulevard Historic District |
| Lincoln County Courthouse |
| Lincoln School |
| Lincoln School |
| Lincoln School |
| Lincoln Street Historic District |
| Lindauer and Rupert Block |
| Linden High School |
| Linden Methodist Church |
| Linden Street Historic District |
| Lindsley, Perry, House |
| Lindstrom, John, Round Barn |
| Lockwood Barn |
| Lodi Downtown Historic District |
| Lodi Street-Prairie Street Historic District |
| Loeffler, Otto and Ida, House |
| Loewe-Weis-Wilson Farm |
| Lohman Funeral Home and Livery Stable |
| Longfellow School |
| Longfellow School |
| Look West Historic District |
| Loomis, Horace, House |
Data from United States Park Service and Wikidata
