Wisconsin - Area of significance: Architecture
| Lord, Charles, House |
| Losey Memorial Arch |
| Lougee, George A., House |
| Louisiana Street/Seventh Avenue Historic District |
| Lovejoy and Merrill-Nowlan Houses |
| Lueder, Rudolph, 13 Sided Barn |
| Luther Memorial Church |
| Lutze Housebarn |
| Lutz, Robert, House |
| Mace, Garwin A., House |
| Mace, Garwin, Lime Kilns |
| Machek, Robert, House |
| Machinery Row |
| Mackie Building |
| Madison Candy Company |
| Madison Masonic Temple |
| Madison Saddlery Company |
| Madison Street Historic District |
| Main Avenue Historic District |
| Main Hall |
| Main Hall/La Crosse State Normal School |
| Main Hall, Lawrence University |
| Main Street Commercial Historic District |
| Main Street Commercial Historic District |
| Main Street Commercial Historic District |
| Main Street Commercial Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Main Street Historic District |
| Manitou Camp |
| Manitowoc County Courthouse |
| Mann, John, House |
| Mann, William G., House |
| Manor House |
| Mansion Hill Historic District |
| Manson, Charles L. and Dorothy, House |
| Maple Park Historic District |
| Marathon County Fairgrounds |
| Marchetti, Louis, House |
| Marcus, Samuel and Nina, House |
| Maria Angelorum Chapel |
| Marquette Bungalows Historic District |
| Marquette County Courthouse and Marquette County Sheriff's Office and Jail |
| Marquette Historic District |
| Marshall & Ilsley Bank |
| Marshall Memorial Hall |
| Marshfield Central Avenue Historic District |
| Marshfield Post Office |
| Martens, Julius J., Company Building |
| Marx, Albert and Theresa, House |
| Maryland Block |
| Masonic Temple |
| Masonic Temple |
| Masonic Temple Building |
| Mathey Building |
| Mathias Mitchell Public Square-Main Street Historic District |
| Mathie, Karl, House |
| Mayer Boot and Shoe Company Building |
| Mayer, George P., Boathouse |
| Mazomanie Downtown Historic District |
| McCall Street Historic District |
| McCarthy, Timothy C. and Katherine, House |
| McClelland-Kasuboski House |
| McClurg Building |
| McCullough and Dixon Steam Laundry and Soap Company |
| McDermott, William and Annie, House |
| McDonell High School |
| McEwens, John F., House |
| McFarland House |
| McFarlane, Harold J. and Agnes, Stone House and Barn |
| McIntosh-Goodrich Mansion |
| McKenzie, Monroe, House |
| McKinley Boulevard Historic District |
| McMicken, Alexander Herschel and Pauline G., House |
| McMillan, David, House |
| Mead Bank |
| Mecikalski General Store, Saloon, and Boardinghouse |
| Medford Free Public Library |
| Medford Post Office |
| Melster, John and Florence, House |
| Melvin Avenue Residential Historic District |
| Memorial Hall |
| Memorial Hall |
| Menomonee Falls City Hall |
| Menomonee Golf Club |
| Menomonie Downtown Historic District |
| Merchant Row Historic District |
| Merchants Avenue Historic District |
| Merrell, Henry, House |
| Merrill Avenue Historic District |
| Merrill, Levi, House |
| Merrill Post Office |
| Merten, Charles, House |
| Messer-Mayer Mill |
Data from United States Park Service and Wikidata
