| P T O'MALLEY LUMBER CO INCBaltimore, MD | 88600 | 7 |
| PANAMA SOLUTION LLCWestminster, MD | 2931644 | 2 |
| PARAMOUNT FEED & SUPPLY INCHagerstown, MD | 7532 | 16 |
| PARIS FOODS CORPORATIONTrappe, MD | 56685 | 1 |
| PARKS EXCAVATING & TRUCKING INCDeale, MD | 942867 | 21 |
| PAUL HAULSUpper Marlboro, MD | 3476319 | 1 |
| PAUL M JONES LUMBER COMPANY INCSnow Hill, MD | 64750 | 2 |
| PAUL M VITOBowie, MD | 1310639 | 4 |
| PAUL-LIN ENTERPRISES INCSalisbury, MD | 1389471 | 2 |
| PAYE-1 LLCEdgewood, MD | 3521892 | 2 |
| PAZIFIC TRUCKING LLCBrooklyn, MD | 3434943 | 2 |
| PCM SERVICES INCBeltsville, MD | 665093 | 46 |
| PENALO'S TRANSPORTATION LLCOwings Mills, MD | 3449982 | 1 |
| PERDUE TRANSPORTATION INCORPORATEDSalisbury, MD | 204935 | 289 |
| PERRY P KENNEDYCentreville, MD | 353730 | 3 |
| PESTERA PLUS LLCBeltsville, MD | 3548667 | 2 |
| PFOTRUCKING LLCSalisbury, MD | 4411341 | 3 |
| PHIL BROWN & SONS LLCChurch Hill, MD | 2843002 | 2 |
| PHILKO TRANSPORTATION LLCUpper Marlboro, MD | 4000384 | 1 |
| PINDER TRUCKING LLCEast New Market, MD | 4230664 | 6 |
| PIONEER CONSTRUCTION LLCEdgewood, MD | 816209 | 4 |
| PIONEER WELDING LIMITED LIABILITY COMPANYElkton, MD | 3218230 | 3 |
| PJS ELITE LOGISTICHalethorpe, MD | 4580568 | 1 |
| PLATINUM HAULING LLCReisterstown, MD | 4482648 | 1 |
| PLEASANT VIEW LANDSCAPESBowie, MD | 2352847 | 4 |
| POINT TO POINT TRUCKING LLCPasadena, MD | 1212827 | 2 |
| POLARIS DEVELOPMENT CORPORATIONHanover, MD | 620305 | 8 |
| PORT TRANSPORTATION INCBaltimore, MD | 1580410 | 14 |
| POTOMAC DIVERSIFIED TRANSPORT LLCGaithersburg, MD | 4250413 | 1 |
| POTOMAC HORTICULTURERockville, MD | 1473787 | 2 |
| POTTS & CALLAHAN INCBaltimore, MD | 88545 | 52 |
| POWER TRANSPORT SYSTEMS LLCGaithersburg, MD | 2185026 | 23 |
| POWERCON CORPORATIONSevern, MD | 88547 | 4 |
| POWERS2U LLCWhite Plains, MD | 4049473 | 1 |
| PRIMEPOINT CORPORATIONReisterstown, MD | 4347016 | 10 |
| PRIORITY CONSTRUCTION CORPORATIONBaltimore, MD | 1055173 | 58 |
| PRITCHETT'S TRANSPORTATION COMPANY INCCambridge, MD | 101545 | 4 |
| PROACE MOVING AND STORAGE LLCRockville, MD | 1182644 | 2 |
| PROG LOGISTICS LLCWindsor Mill, MD | 3463329 | 2 |
| PROMISE DELIVERY LLCEllicott City, MD | 3083784 | 2 |
| PROPERTY PRESERVATION CARE LLCBrandywine, MD | 3474948 | 3 |
| PUSHING FORWARD TRUCKING LLCBaltimore, MD | 3616653 | 1 |
| PWC CONSTRUCTION SERVICES LLCHyattsville, MD | 3507289 | 1 |