All - Constructed - 1940–1949
| Landing Beaches, Aslito-Isley Field, and Marpi Point |
| Laney, Ben, Bridge |
| La Puerta Lodge |
| Liberty Warehouse Nos. 1 and 2 |
| Lidice Memorial |
| Lighter-than-Air Ship Hangars |
| Lil's Diner |
| Lincolnton Recreation Department Youth Center |
| Lisner Auditorium |
| Little Buckaroo Ranch Barn |
| Little Church of the West |
| Little Outfit Schoolhouse, The |
| Long, R. A., House |
| Longwood Gardens District |
| Los Alamos Scientific Laboratory |
| Lovington Fire Department Building |
| Luna Lodge |
| Lustron Houses of Jermain Street Historic District |
| Malesso Japanese Rice Mill |
| Mansfield Hollow Dam |
| Manson, Charles L. and Dorothy, House |
| Maple Springs Ranger Station |
| Maquoketa Company-Clinton Machine Company Administration Building |
| Marcel Breuer House and Studio |
| Marconi, Guglielmo, Memorial |
| Mark Twain State Park Picnic Shelter at Buzzard's Roost |
| Martin County Courthouse |
| Maryhill |
| Mason Temple, Church of God in Christ |
| McFadden House |
| McKinley Climatic Laboratory |
| Memphis and Arkansas Bridge |
| Mennonite Settler Statue |
| Mesrobian, Mihran, House |
| Minidoka Internment National Monument |
| Miss Worcester Diner |
| Modern Diner |
| Monarch Diner |
| Monjeau Lookout |
| Monroe Street School |
| Monte Vista Hotel |
| Moore Lookout Tower |
| Moore-Mayo House |
| Morgan State University Memorial Chapel |
| Municipal Asphalt Plant |
| Municipal Building-City Hall |
| National Memorial Cemetery of the Pacific |
| Naval Air Station Richmond Headquarters Building |
| Neufeld, Albert C. and Ellen H., House |
| Niedecker, Lorine, Cottage |
| Nielson, John R., Cabin |
| Nob Hill Business Center |
| North Durham County Prison Camp (Former) |
| North Fellows Historic District |
| Officer's Club, Douglas Prisoner of War |
| O'Keeffe, Georgia, Home and Studio |
| Old Brass |
| Old German Baptist Brethern Church |
| Old Town Residential Historic District |
| Opana Radar Site |
| Orgone Energy Observatory |
| Ostrander Lake Ski Hut |
| Our Lady of the Ozarks Shrine |
| Overland Theater |
| Palmer Fire School |
| Parachute Building |
| Parham Apothecary Building |
| Patterson House |
| Pear Lake Ski Hut |
| Penhaligen, Charles and Mary Kempf, House |
| Pentagon, The |
| Perrysburg Water Maintenance Building |
| Perry School |
| Pickens, R.A., II, House |
| Pine Bluff Arsenal Access Road Bridge No. 2280 |
| Plaza Theater |
| Plymouth Post Office |
| Pocahontas State Park Historic District |
| Pocasset Gymnasium |
| Poirier's Diner |
| Polasek, Albin, House and Studio |
| Pomona High School, Former |
| Pope-Leighey House |
| Portsmouth Community Library |
| Pratt, Wallace E., House |
| Presentation Children's Home |
| Presque Isle Harbor Breakwater Light |
| Princeville School |
| Pyle, Ernie, House |
| Quayle, Margaret, Lustron House |
| Queen City Pool and Pool House |
| Radar Station B-71 |
| Raleigh Bonded Warehouse |
| Reaction Motors Rocket Test Facility |
| Red Cliff Bridge |
| Redstone, Louis G., Residential Historic District |
| Reinke, Mr. and Mrs. Robert C., House |
| Republic Cafe |
| Rio Grande Southern Railroad Derrick Car |
| Riverside Park Dance Pavillion |
Data from United States Park Service and Wikidata
