| Pavco | Moss Point | MS |
| P B Johnson Commons West | Oxford | MS |
| P.E. Barnes Lumber | Greenville | MS |
| Penn Tire & Rubber | Tupelo | MS |
| Performing Arts Center | Hattiesburg | MS |
| Phillips Milk Of Magnesia | Gulfport | MS |
| Physical Plant, University Of Mississippi | Oxford | MS |
| Pidgeon-Thomas Iron | Corinth | MS |
| Pines Building | Whitfield | MS |
| Planters Bank & Trust | Greenville | MS |
| Planters Oil Mill & Gin | Kosciusko | MS |
| Plant Sweatt | Meridian | MS |
| Pontiac Eastern | Purvis | MS |
| Pontotoc Dairies | Pontotoc | MS |
| Porter Homer C & Sons | Jackson | MS |
| Potasium Nitrate Plant | Vicksburg | MS |
| Power Plant | Moselle | MS |
| President Jefferson | Pascagoula | MS |
| President Madison (Fourth) | Pascagoula | MS |
| President Pierce (Third) | Pascagoula | MS |
| Presto Manufacturing | Jackson | MS |
| Presto Manufacturing | Tougaloo | MS |
| Public Service Commission | Yazoo City | MS |
| Pulley Hall, Southern Station Box 5001 | Hattiesburg | MS |
| Quaker Oats | Pascagoula | MS |
| Quitman Lumber | Quitman | MS |
| Rapid | Pascagoula | MS |
| Recreation Building (108) | Meridian | MS |
| Red Jacket | Pascagoula | MS |
| Redwoods Power Plant | Moss Point | MS |
| Reef Industries | Pascagoula | MS |
| Refuge Cotton Oil | Greenville | MS |
| Refuge Cotton Oil | Vicksburg | MS |
| Reichhold Chemical | Gulfport | MS |
| Rex Brown Steam Plant | Jackson | MS |
| Rhodes Floor Covering | Biloxi | MS |
| R.H. Watkins High School | Laurel | MS |
| Rice Hall | Starkville | MS |
| Rittners Industrial Enameling | Bay Saint Louis | MS |
| Riverside Industries | Marks | MS |
| Riverside Oil Mill | Marks | MS |
| R.L. Caylor Hall, Box A-1 | Cleveland | MS |
| R.L. Nix Plumbing | Laurel | MS |
| Rosewood Building | Whitfield | MS |
| Rossant Richard | Jackson | MS |
| Rover | Pascagoula | MS |
| Rudolph Wurlitzer | Corinth | MS |
| Russell Aluminum | Meridian | MS |
| Rust Engineering | Meridian | MS |
| Saint Regis Paper | Ferguson | MS |
