| 1 | PRK | Swallow Aviacion, S.L. | Callsign: Paraca, | E | AVCODES |
| 2 | PRKA | PARK AVENUE STORAGE CORPORATION | | | SCAC3 |
| 3 | PRKA | PARK AVENUE STORAGE CORPORATION | | | SCAC4 |
| 4 | PRKB | PARKER BROTHERS TRUCKING CORPORATIO | | | SCAC3 |
| 5 | PRKC | PARK RIDGE TRANSPORT INC | | | SCAC3 |
| 6 | PRKC | PARK RIDGE TRANSPORT INC | | | SCAC4 |
| 7 | PRKD | PRAIRIE | | | SCAC4 |
| 8 | PRKE | PARKER TRANSFER AND STORAGE, INC | | | SCAC3 |
| 9 | PRKG | PRO TRUCKING INC | | | SCAC4 |
| 10 | PRKH | P & R TRUCKING | | | SCAC3 |
| 11 | PRKH | P & R TRUCKING INC | | | SCAC4 |
| 12 | PRKI | PARKS MOVING & STORAGE INC | | | SCAC3 |
| 13 | PRKI | P & R TRUCKING | | | SCAC4 |
| 14 | PRKII | Przedsiębiorstwa Robót Kolejowych i Inżynieryjnych | | PL | TRAFFIC |
| 15 | PRKJ | PRM TRUCKING | | | SCAC4 |
| 16 | PRKKR | Przedsiębiorstwo Robót Komunikacyjnych w Krakowie S.A. | | PL | VKM |
| 17 | PRKL | PROGRESSIVE TRUCK LINES INC | | | SCAC3 |
| 18 | PRKL | PERKINS LOGISTICS LLC | | | SCAC4 |
| 19 | PRKM | PARK MOTOR CARRIER, INC | | | SCAC3 |
| 20 | PRKM | PARK MOTOR CARRIER INC | | | SCAC4 |
| 21 | PRKN | PARKER TRANSPORT LLC | | | SCAC4 |
| 22 | PRKO | PARKER OIL COMPANY | | | SCAC4 |
| 23 | PRKQ | PARK TRANSFER & STORAGE CO | | | SCAC3 |
| 24 | PRKQ | PERO TRUCKING INC | | | SCAC4 |
| 25 | PRKR | PERK TRANSPORTATION INC | | | SCAC3 |
| 26 | PRKS | PARKS MOVING & STORAGE INC | | | SCAC3 |
| 27 | PRKS | PARKS MOVING & STORAGE INC | | | SCAC4 |
| 28 | PRKT | PRICKETT TRANSPORTATION CO | | | SCAC3 |
| 29 | PRKU | PROTANK LOGISTICS CO LTD | | RC | BIC |
| 30 | PRKU | PROTANK LOGISTICS CO LTD | | | SCAC4 |
| 31 | PRKV | PERKINS, VACHEL TRUCKING LLC | | | SCAC4 |
| 32 | PRKW | PARKER TRUCKING | | | SCAC4 |
| 33 | PRKWR | Przedsiębiorstwo Robót Kolejowych i Inżynieryjnych S.A. | | PL | VKM |
| 34 | PRKX | The P. & P. Car Line, Inc. | 7/1935-10/1957; eliminated 10/1958 | | NAKINA |
| 35 | PRKX | The Park & Pollard Co. | 7/1930-7/1932 | | NAKINA |
| 36 | PRKX | The P. & P. Car Line, Inc. | 4/38-10/57; eliminated 10/58 | | NRHS |
| 37 | PRKX | P. & P. CAR LINE, INC. [PARK & POLLARD CO.] | | | PWRC |
| 38 | PRKY | PURKEY TRUCKING | | | SCAC3 |
