| Litra USA |
West Orange, New Jersey |
| Little Giant |
Fort Wayne, Indiana |
| Little Harbor Window Company |
Berwick, Maine |
| Lloyd Industries |
Montgomeryville, Pennsylvania |
| Lloyd Industries |
Orange Park, Florida |
| Lochinvar LLC |
Lebanon, Tennessee |
| Lochinvar, LLC |
Lebanon, Tennessee |
| Lockheed Window Corporation |
Pascoag, Rhode Island |
| Loewen Windows and Doors |
Tucson, Arizona |
| Lomanco, Inc. |
Jacksonville, Arkansas |
| Lonyung LED Lighting |
Zhongshan Shi, Guangdong Sheng |
| Los Angeles Lighting Manufacturing Company |
El Monte, California |
| Lota USA, LLC |
Los Angeles, California |
| Lotus LED Lights |
Blaine, Washington |
| Louis Poulsen |
Ft. Lauderdale, Florida |
| Louisiana-Pacific Corporation |
Nashville, Tennessee |
| Louisiana-Pacific Corporation |
Red Bluff, California |
| Louisiana-Pacific Corporation |
Wilmington, North Carolina |
| Louisiana-Pacific Corporation |
Houlton, Maine |
| Louisiana-Pacific Corporation |
Carthage, Texas |
| Louisiana-Pacific Corporation |
Hanceville, Alabama |
| Louisiana-Pacific Corporation |
Jasper, Texas |
| Louisiana-Pacific Corporation |
Roxboro, North Carolina |
| Louisiana-Pacific Corporation |
Thomasville, Alabama |
| Louisiana-Pacific Corporation |
Sagola, Michigan |
| Louisiana-Pacific Corporation |
Watkins, Minnesota |
| Louisiana-Pacific Corporation |
Hayward, Wisconsin |
| Louisiana-Pacific Corporation |
Newberry, Michigan |
| Louisiana-Pacific Corporation |
Roaring River, North Carolina |
| Louisiana-Pacific Corporation |
Tomahawk, Wisconsin |
| Louisiana-Pacific Corporation |
Two Harbors, Minnesota |
| Louverlight Window Products, Inc. |
Medley, Florida |
| Louvers International |
Elmhurst, Illinois |
| LSP Products Group (LSP) |
Irving, Texas |
| LSP Products Group (LSP) |
Carson City, Nevada |
| LTG Inc. |
Spartanburg, South Carolina |
| Lucas Metal Works Inc. |
Ochelata, Oklahoma |
| Lucisano Brothers Inc. |
Bristol, Pennsylvania |
| Ludowici Roof Tile, Inc. |
New Lexington, Ohio |
| Lukjan Metal Products Inc. |
Prairie Farm, Wisconsin |
| Lukjan Metal Products Inc. |
Kings Mountain, North Carolina |
| Lukjan Metal Products Inc. |
Conneaut, Ohio |
| Lumalier UV Air & Surface Disinfection |
Memphis, Tennessee |
| Lumax Lighting |
Altoona, Pennsylvania |
| LumenPros, Inc. |
Sauk Centre, Minnesota |
| Lumentruss |
Montreal, Quebec |
| Luminii Corporation |
Niles, Illinois |
| Luminiz Inc. |
Etobicoke, Ontario |
| Lumiram Electric Corporation |
Valley Cottage, New York |
| Lumirama Inc. |
Laval, Quebec |