| 4601 | RJTW | RJT TRUCKING INC | SCAC3 | ||
| 4602 | RJUR | R & J TRUCKING & RECYCLING INC | SCAC4 | ||
| 4603 | RJVR | RJV TRANSPORT INC | SCAC4 | ||
| 4604 | RJVS | RUIZ, J V & SON TRUCKING | SCAC3 | ||
| 4605 | RJVT | RJV TRANSFER | SCAC4 | ||
| 4606 | RJWE | R J W ENTERPRISES INC | SCAC3 | ||
| 4607 | RJWE | R J W LOGISTICS INC | SCAC4 | ||
| 4608 | RJWI | RJW TRANSPORT INC | SCAC4 | ||
| 4609 | RJWM | R J W MOVING INC | SCAC3 | ||
| 4610 | RJWM | R J W MOVING INC | SCAC4 | ||
| 4611 | RJWN | REINING, W J & SONS | SCAC3 | ||
| 4612 | RJWT | RATCLIFF, J W TRUCKING | SCAC3 | ||
| 4613 | RJWT | RJW TRUCKING CO INC | SCAC4 | ||
| 4614 | RJWV | R J TRUCKING | SCAC3 | ||
| 4615 | RJXC | ROADRAJ TRANSPORT INC | SCAC4 | ||
| 4616 | RJXM | RJ TRANSFER SYSTEMS | SCAC4 | ||
| 4617 | RJXP | R J EXPRESS INC | SCAC3 | ||
| 4618 | RJXS | R J EXPRESS LTD | SCAC4 | ||
| 4619 | RJXT | ROJO TRANSPORT | SCAC4 | ||
| 4620 | RJZ | Royal Jordanian Air Force | ICAO1 | ||
| 4621 | RK | Rhenus Keolis GmbH & Co. KG | Mainz | D | privat-bahn.de |
| 4622 | RK | Rendsburger Kreisbahn | D | TRAFFIC | |
| 4623 | RK | Rhenus Keolis GmbH | DE | VKM | |
| 4624 | RKA | Air Afrique | ICAO1 | ||
| 4625 | RKAB | RENKAS, CRAIG W | SCAC4 | ||
| 4626 | RKAL | RECKART LOGISTICS INC. | SCAC4 | ||
| 4627 | RKAM | R & KA | SCAC4 | ||
| 4628 | RKAP | RED KAP SALES INC | SCAC4 | ||
| 4629 | RKB | Rødkærsbro - Kjellerup Banen (Kjellerupbanen) | 1912 - 1924 | DK | jernbanen.dk |
| 4630 | RKB | Rødkærsbro - Kjellerup Banen (Kjellerupbanen) | 1912 - 1924 | DK | TRAFFIC |
| 4631 | RKBF | ROCKY BEACH FARMS INC | SCAC3 | ||
| 4632 | RKBL | ROYAL KENT BUS LINES INC | SCAC3 | ||
| 4633 | RKBL | RAKEBY LIMITED | SCAC4 | ||
| 4634 | RKBQ | RIVERA, K & B LIQUID LOGISTICS LLC | SCAC4 | ||
| 4635 | RKBS | RICKS BACKHOE SERVICE INC | SCAC4 | ||
| 4636 | RKC | DAS Airlines | ICAO1 | ||
| 4637 | RKCC | ROCKET CITY CHARTER SERVICE INC | SCAC3 | ||
| 4638 | RKCE | ROCK CREEK EXPRESS INC | SCAC3 | ||
| 4639 | RKCG | RUKY INTERNATIONAL COMPANY | SCAC4 | ||
| 4640 | RKCL | RIMROCK COLONY | SCAC4 | ||
| 4641 | RKCT | ROCK CREEK TRUCKING | SCAC4 | ||
| 4642 | RKCW | RAKOWSKI CARTAGE & WRECKING LTD | SCAC4 | ||
| 4643 | RKCX | Knox Kershaw, Inc. | added 1/1984; eliminated 4/1985; 1/1994-7/2005 (not listed) | NAKINA | |
| 4644 | RKCX | Royce Kershaw Co., Inc. | eliminated 1/1984 | NAKINA | |
| 4645 | RKCX | Knox Kershaw Co., Inc. | added 1/1969; 4/1970-1/1980 | NAKINA | |
| 4646 | RKCX | Knox Kershaw Co., Inc. | added 1/69; 4/70-1/80; eliminated 4/85; 1/94-7/2000 | NRHS | |
| 4647 | RKCX | *KNOX KERSHAW INC (ROYCE KERSHAW CO., INC.) | PWRC | ||
| 4648 | RKCX | Knox Kershaw | RSRV | ||
| 4649 | RKCX | KNOX KERSHAW INC | SCAC4 | ||
| 4650 | RKCY | RANDOLPH PACKING CO | SCAC4 | ||
| 4651 | RKDA | ROCKDALE TRANSPORTATION ENTERPRISES | SCAC4 | ||
| 4652 | RKDB | ROCK LEASING INC | SCAC4 | ||
| 4653 | RKDC | ROCKSIDE DISTRIBUTION CENTER | SCAC3 | ||
| 4654 | RKDC | ROADSTAR TRUCKING INC | SCAC4 | ||
| 4655 | RKDF | R K D FARMS | SCAC3 | ||
| 4656 | RKDF | RINKER BOAT COMPANY LLC | SCAC4 | ||
| 4657 | RKDG | R K D TRUCKING INC | SCAC3 | ||
| 4658 | RKDG | ROGERS TRUCKS & EQUIPMENT INC | SCAC4 | ||
| 4659 | RKDI | ROCKETT DELIVERY SERVICE | SCAC3 | ||
| 4660 | RKDL | RINKER, DALE F | SCAC3 | ||
| 4661 | RKEB | RIDDICK ENTERPRISES INC | SCAC4 | ||
| 4662 | RKED | ROAD KING ENTERPRISES AND DISTRIBUT | SCAC4 | ||
| 4663 | RKEE | R & K EXPRESS INC | SCAC4 | ||
| 4664 | RKEF | ROAD KING EXPRESS FREIGHT INC | SCAC4 | ||
| 4665 | RKEI | ROCKET EXPRESS INC | SCAC3 | ||
| 4666 | RKEN | ROCKET TRANSPORTATION INC | SCAC3 | ||
| 4667 | RKEN | RYKER ENTERPRISES INC | SCAC4 | ||
| 4668 | RKEP | ROCKET EXPRESS | SCAC3 | ||
| 4669 | RKEQ | ROCKEY, M F MOVING COMPANY | SCAC3 | ||
| 4670 | RKEQ | ROCKY BAR RANCH | SCAC4 | ||
| 4671 | RKER | R K DISTRIBUTING INC | SCAC4 | ||
| 4672 | RKES | ROCKET EXPRESS INC | SCAC3 | ||
| 4673 | RKES | ROCKIN K ENTERPRISES LLC | SCAC4 | ||
| 4674 | RKET | ROCKET TRUCKING | SCAC3 | ||
| 4675 | RKEV | RACE KIT EVENT SERVICE INC | SCAC4 | ||
| 4676 | RKEY | ROCKFORD, KERRY ENTERPRISES INC | SCAC4 | ||
| 4677 | RKFC | ROCKFORD CARRIER INC | SCAC4 | ||
| 4678 | RKFI | R K FUELS INC | SCAC4 | ||
| 4679 | RKFL | ROCK FALLS FREIGHT & LEASING CORP | SCAC3 | ||
| 4680 | RKFM | REMARK FRESH MARKETS | SCAC4 | ||
| 4681 | RKFT | RKF TRUCK LINES LTD | SCAC3 | ||
| 4682 | RKG | Rockingham R.R. (Co.) | 7/1923-10/1966 | NAKINA | |
| 4683 | RKG | Rockingham R.R. Co. | 4/38-10/66 | NRHS | |
| 4684 | RKG | ROCKINGHAM RAILROAD CO. | PWRC | ||
| 4685 | RKGI | R & K LOGISTICS INC | SCAC4 | ||
| 4686 | RKGL | RICE TRUCKING LLC | SCAC4 | ||
| 4687 | RKGN | RESOURCES TRUCKING OF CALIFORNIA IN | SCAC3 | ||
| 4688 | RKGP | ROCKING R TRANSPORT | SCAC4 | ||
| 4689 | RKGQ | RKG CARRIERS INC | SCAC4 | ||
| 4690 | RKGT | ROCKING T INC | SCAC4 | ||
| 4691 | RKGX | River King Coal | RSRV | ||
| 4692 | RKH | Royal Khmer Airlines | IATA: RK | ICAO1 | |
| 4693 | RKH | Regionalverkehr Kurhessen GmbH | D | TRAFFIC | |
| 4694 | RKHA | ROCK HAULERS INC | SCAC3 | ||
| 4695 | RKHA | ROCKET DELIVERY INC | SCAC4 | ||
| 4696 | RKHD | RKH INDUSTRIES INC | SCAC4 | ||
| 4697 | RKHI | RICH TRUCKING INC | SCAC4 | ||
| 4698 | RKHJ | ROCKHILL, H J INC | SCAC3 | ||
| 4699 | RKIA | ROCK-IT CARGO USA LLC | SCAC4 | ||
| 4700 | RKIB | ROCK-IT CARGO USA LLC | SCAC4 |