Wisconsin - Criteria: C (architecture/engineering)
| Lie, Aslak, Cabin |
| Lincoln County Courthouse |
| Lincoln School |
| Lincoln School |
| Lincoln Street Historic District |
| Lindauer and Rupert Block |
| Linden Methodist Church |
| Lindsley, Perry, House |
| Little Kaukauna Lock and Dam Historic District |
| Lockwood Barn |
| Lodi School Hillside Improvement Site |
| Lodi Street-Prairie Street Historic District |
| Lohman Funeral Home and Livery Stable |
| Longfellow School |
| Lougee, George A., House |
| LOUISIANA (Shipwreck) |
| Louisiana Street/Seventh Avenue Historic District |
| Lovejoy and Merrill-Nowlan Houses |
| LUCERNE (Shipwreck) |
| Lutze Housebarn |
| Lutz, Robert, House |
| Machinery Row |
| Mackie Building |
| Madison Candy Company |
| Madison Masonic Temple |
| Madison Waterworks |
| 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 |
| Manchester Street Bridge |
| Manitou Camp |
| Manitowoc County Courthouse |
| Mann, John, 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 |
| Marion Park Pavilion |
| Marquette Bungalows Historic District |
| Marquette County Courthouse and Marquette County Sheriff's Office and Jail |
| Marquette Historic District |
| Marshall Memorial Hall |
| Marshfield Central Avenue Historic District |
| Marsh Rainbow Arch Bridge |
| Martens, Julius J., Company Building |
| Marx, Albert and Theresa, House |
| Masonic Temple |
| Masonic Temple Building |
| Mathias Mitchell Public Square-Main Street Historic District |
| Mathie, Karl, House |
| Mayer, George P., Boathouse |
| Mazomanie Downtown Historic District |
| McCall Street Historic District |
| McCarthy, Timothy C. and Katherine, House |
| McClurg Building |
| McDonell High School |
| McFarland House |
| McIntosh-Goodrich Mansion |
| McKenzie, Monroe, House |
| McMicken, Alexander Herschel and Pauline G., House |
| McMillan, David, House |
| Medford Free Public Library |
| Medford Post Office |
| Memorial Hall |
| Menomonie Downtown Historic District |
| Merchants Avenue Historic District |
| MERIDIAN (schooner) Shipwreck Site |
| Merrell, Henry, House |
| Merrill, Levi, House |
| Meyerhofer Cobblestone House |
| Middleton Depot, Chicago, Milwaukee, and St. Paul Railroad |
| Mielke, Joseph, House |
| Miller House |
| Miller, H. S., Bank |
| Miller, Marshall D., Boathouse |
| Mills, Job, Block |
| Mills, Richard W. and Margaret, House |
| Mills, Simeon, House |
| Milton College Historic District |
| Milton House |
| Milwaukee Breakwater Light |
| Milwaukee City Hall |
| Milwaukee County Courthouse |
| Milwaukee County Dispensary and Emergency Hospital |
| Milwaukee County School of Agriculture and Domestic Economy Historic District |
Data from United States Park Service and Wikidata
