Arizona - Area of significance: Architecture
| Los Olivos Historic District |
| Lovin and Withers Cottages |
| Lovin & Withers Investment House |
| Lowell Ranger Station |
| Lower Cibecue Lutheran Mission |
| Luhrs Building |
| Lynx Creek District |
| MacLennan House |
| Magma Hotel |
| Mahoney, W. P., House |
| Main Building, Tempe Normal School |
| Mandell and Meyer Building |
| Manistee Ranch |
| Manjarres House |
| Manning, Levi H., House |
| Marable, George, House |
| Maricopa County Courthouse |
| Marist College Historic District |
| Marks House |
| Marsh Heights Historic District |
| Martinez, W. D., General Merchadise Store |
| Martin/Ling House |
| Mary Jane Colter Buildings (Hopi House, The Lookout, Hermit's Rest, and the Desert View Watchtower) |
| Masonic Hall |
| Masonic Temple |
| Masonic Temple |
| Master Mechanic's House |
| Matthews Hall |
| Matus, Antonio, House and Property |
| Mayhew, Carmelita, House |
| McCornack, Colonel Willard H., House |
| McCullough-Price House |
| McFadden, Phillip G. House |
| McNair, Jonas, House |
| Mediterranean Style House |
| Mediterranean Style House |
| Medlock Place Historic District |
| Meehan/Gaar House |
| Mee, Joe, House |
| Men's Gymnasium, University of Arizona |
| Methodist Episcopal Church |
| Methodist Parsonage |
| Mexican Consulate |
| Miami Community Church |
| Miller, Hugo, House |
| Miller, Pryor, House |
| Milligan House |
| Ming, A.B., House |
| Mingus Lookout Complex |
| Miracle Mile Historic District |
| Mohave County Courthouse and Jail |
| Mohave County Hospital |
| Monroe School |
| Monte Vista Lookout Cabin |
| Montezuma Castle National Monument |
| Moqui Lookout Cabin |
| Moqui Ranger Station |
| Morgan, David-Bronson, Earl A., House |
| Morgan House |
| Morin House |
| Mormon Church |
| Morrison House |
| Morrow-Hudson House |
| Mountain States Telephone and Telegraph Exchange Building |
| Muheim House |
| Mullen, C. P., House |
| Museum of Northern Arizona Exhibition Building |
| Naco Border Station |
| Navajo County Courthouse |
| Navajo National Monument |
| Navajo Nation Council Chamber |
| Negrette House |
| Nogales High School |
| Nogales Steam Laundry Building |
| Noon, A. S., Building |
| North Encanto Historic District |
| North End Historic Residential District |
| Northern Arizona Normal School Historic District |
| Northfield Historic District |
| North Garfield Historic District |
| North Prescott Townsite Historic District |
| Norton, John H., and Company Store |
| Oasis Court |
| O'Brien, Mathew, House |
| Oddfellows Home |
| Officer's Quarters |
| OK Ranch Historic District |
| Old Adobe Patio |
| Old Barber Shop |
| Old Governor's Mansion |
| Old Library Building |
| Old Main, University of Arizona |
| Old Tubac Schoolhouse |
| Olney, George A/Everett E. Ellinwood House |
| Olney, George A., House |
| Ong's, Jim, Market |
| Orchard River Garden Park |
| Ortiz House |
| Osborn, William Lewis, House |
| Otis House |
Data from United States Park Service and Wikidata
