| 301 | RINI | RETAYLORS INTERIOR INC | | | SCAC4 |
| 302 | RINJ | RINCON, JORGE TRUCKING COMPANY INC | | | SCAC3 |
| 303 | RINK | RINKER TRANSPORT INC | | | SCAC3 |
| 304 | RINK | RINK-TEC INTERNATIONAL INC | | | SCAC4 |
| 305 | RINN | RINN CORP | | | SCAC3 |
| 306 | RINO | RINAUDO TRUCKING INC | | | SCAC3 |
| 307 | RINO | RECTOR INTERNATIONAL | | | SCAC4 |
| 308 | RINP | RINCHEM COMPANY INC, THE | | | SCAC3 |
| 309 | RINQ | RINEHART, T & S | | | SCAC3 |
| 310 | RINQ | R I NORTHWEST INC | | | SCAC4 |
| 311 | RINR | RINE, RAMON | | | SCAC3 |
| 312 | RINS | RITTER & SMITH TRUCKING INC | | | SCAC3 |
| 313 | RINS | ROMTRANS INC | | | SCAC4 |
| 314 | RINT | RINGER TRUCKING INC | | | SCAC3 |
| 315 | RINU | HERMANN RINNEN JUNIOR | | D | BIC |
| 316 | RINU | HERMANN RINNEN JR | | | SCAC4 |
| 317 | RINV | ROSS INCINERATION SERVICES INC | | | SCAC3 |
| 318 | RINV | ROSSI INC | | | SCAC4 |
| 319 | RINW | RING, NEIL | | | SCAC3 |
| 320 | RINW | ROHRER INCORPORATED | | | SCAC4 |
| 321 | RINY | R-WAY INC | | | SCAC4 |
| 322 | RIO | RIO Linhas Aereas Ltda. | IATA: R3, IATA Prefix: 970, Ceased operations during 2017. | BR | AVCODES |
| 323 | RIOA | RIO STONE | | | SCAC4 |
| 324 | RIOB | RIO BRAVO TRANSPORT INC | | | SCAC3 |
| 325 | RIOB | RIO BRAVO TRUCKING SA DE CV | | | SCAC4 |
| 326 | RIOC | Roosevelt Island Operationg Corp. | | USA | TRAFFIC |
| 327 | RIOD | RIO TRANS | | | SCAC4 |
| 328 | RIOG | RIO GRANDE EXPRESS FREIGHT INC | | | SCAC3 |
| 329 | RIOG | RIO GRANDE CARTAGE CO | | | SCAC4 |
| 330 | RIOI | RICHARD OIL AND FUEL LLC | | | SCAC4 |
| 331 | RIOL | RIO LINDA MARINE | | | SCAC3 |
| 332 | RIOM | RIOM CORPORATION | | | SCAC3 |
| 333 | RIOM | RIOM CORPORATION | | | SCAC4 |
| 334 | RION | RICE, OWEN F | | | SCAC3 |
| 335 | RIOO | RITCHIE TRUCKING SERVICE, INC | | | SCAC3 |
| 336 | RIOO | RITCHIE TRUCKING SERVICE | | | SCAC4 |
| 337 | RIOP | RIOS, PAUL JR | | | SCAC3 |
| 338 | RIOP | RIO TRANSPORT INC | | | SCAC4 |
| 339 | RIOR | RIOMAR AGENCIES INC. | | | SCAC3 |
| 340 | RIOR | RIOMAR AGENCIES INC. | | | SCAC4 |
| 341 | RIOS | RIOS WOOD & COAL YARD | | | SCAC3 |
| 342 | RIOS | RIOS, M TRUCKING | | | SCAC4 |
| 343 | RIOT | RIO MARINE INC, | | | SCAC3 |
| 344 | RIOV | RIOJAS VASQUEZ, DIANA ROMELIA, ROIO | | | SCAC4 |
| 345 | RIOW | RIGHT-O-WAY TRANSPORTATION INC | | | SCAC3 |
| 346 | RIP | Ilford-Riverton Airways Ltd | Callsign: Ilford, | CDN | AVCODES |
| 347 | RIPA | RHODE ISLAND PUBLIC TRANSIT AUTHORI | | | SCAC3 |
| 348 | RIPA | REFRIGERADOS INTERNACIONALES PARAIS | | | SCAC4 |
| 349 | RIPD | RIPPE, DONALD W | | | SCAC3 |
| 350 | RIPE | RIPPEE, D & S & SON TRUCKING | | | SCAC3 |
| 351 | RIPH | RICHARD, PHILIPPE, LTD | | | SCAC3 |
| 352 | RIPL | RINGSBY-PACIFIC LTD. | | | PWRC |
| 353 | RIPM | R I P TRUCKING | | | SCAC3 |
| 354 | RIPN | R I P TRANSPORTATION | | | SCAC3 |
| 355 | RIPO | RIP-O-BEC INC | | | SCAC4 |
| 356 | RIPP | RIPPEE, RICHARD | | | SCAC3 |
| 357 | RIPR | RIVERSIDE PRODUCE INC | | | SCAC3 |
| 358 | RIPTA | Rhode Island Public Transit Authority | | USA | TRAFFIC |
| 359 | RIPX | Rochester Independent Packer, Inc. | added 7/1969; 4/1970-1/1980; eliminated 5/1983; 1/1994 (not listed) | | NAKINA |
| 360 | RIPX | Rock Island Petroleum Co. | 8/1920 | | NAKINA |
| 361 | RIPX | Rochester Independent Packer, Inc. | added 7/69; 4/70-1/80; eliminated 5/83; 1/94 | | NRHS |
| 362 | RIPX | *ROCK ISLAND PETROLEUM CO. | | | PWRC |
| 363 | RIPX | *ROCHESTER INDEPENDENT PACKER, INC. | | | PWRC |
| 364 | RIPZ | ROANOKE INDUSTRIAL PARK | | | PWRC |
| 365 | RIR | Ronnair Oy | Callsign: Ronnair, | FIN | AVCODES |
| 366 | RIRA | RICHMOND, RAYMOND | | | SCAC3 |
| 367 | RIRA | RILEY RACING LLC | | | SCAC4 |
| 368 | RIRB | RINDAL, ROBERT | | | SCAC3 |
| 369 | RIRB | RINDAL, ROBERT | | | SCAC4 |
| 370 | RIRC | RINCON RECYCLING INC | | | SCAC4 |
| 371 | RIRD | RICHARDS TRANSIT, INC | | | SCAC3 |
| 372 | RIRG | RINGER, G & COMPANY INC | | | SCAC3 |
| 373 | RIRI | RICH, R E TRUCKING CO | | | SCAC3 |
| 374 | RIRL | RIVERA, RAUL TRUCKING | | | SCAC3 |
| 375 | RIRN | RICKELMAN TRUCKING | | | SCAC3 |
| 376 | RIRP | RISINGER TRANSPORT CORP | | | SCAC4 |
| 377 | RIRT | RICHER, ROBERT TRANSPORT | | | SCAC3 |
| 378 | RIRW | REICHERT, R W | | | SCAC3 |
| 379 | RIRX | Southeastern Industrial Enterprises, Inc. | 7/2005; eliminated 10/2006 | | NAKINA |
| 380 | RIRX | Rock Island Oil & Refining Co., Inc. | 4/1947-1/1950 | | NAKINA |
| 381 | RIRX | Duncan Oil Co., Inc. | 7/1937-1/1941 | | NAKINA |
| 382 | RIRX | Rock Island Refining Co. (Duncan Oil Co., Inc.) | 7/1935 | | NAKINA |
| 383 | RIRX | Rock Island Refining Co. | 7/1930-7/1932 | | NAKINA |
| 384 | RIRX | Rock Island Refining Co. (Duncan Oil Co., Inc.) | Apr-38 | | NRHS |
| 385 | RIRX | *ROCK ISLAND OIL & REFINING CO. [DUNCAN OIL CO., INC.] | | | PWRC |
| 386 | RIRX | +SOUTHEASTERN INDUSTRIAL ENTERPRISES, INC. | | | PWRC |
| 387 | RIRX | Southeastern Industrial Enterprises | | | RSRV |
| 388 | RIRX | SOUTHEASTERN INDUSTRIAL ENTERPRISES | | | SCAC4 |
| 389 | RIS | Air Services Ltd. | Callsign: Airis, | CZ | AVCODES |
| 390 | RIS | Aeris Gestion S.L. | Callsign: Aeris, | E | AVCODES |
| 391 | RIS | Aeris Gestion | | | ICAO1 |
| 392 | RIS | Rock Island Southern Ry. (Co.) | 7/1923-7/1954 | | NAKINA |
| 393 | RIS | Rock Island Southern Ry. | 4/38-1/52 | | NRHS |
| 394 | RIS | Regio-Infra-Service Sachsen GmbH | Chemnitz | D | privat-bahn.de |
| 395 | RIS | ROCK ISLAND SOUTHERN RWY. CO. | | | PWRC |
| 396 | RIS | Regio Infra Service | | D | TRAFFIC |
| 397 | RIS | Regio Infra Service Sachsen GmbH | | DE | VKM |
| 398 | RISB | RISBERGS TRUCK LINE | | | SCAC3 |
| 399 | RISB | ROBINSON I SHIPPING CORPORATION LIB | | | SCAC4 |
| 400 | RISC | RIVERSIDE SERVICE CORPORATION | | | SCAC3 |
