| 7301 | PPCU | PROSPERCHEM INC | | | SCAC4 |
| 7302 | PPCV | PRAIRIE PRIDE COOPERATIVE | | | SCAC4 |
| 7303 | PPCW | PRO-POWER CANADA INC | | | SCAC4 |
| 7304 | PPCX | Perfect Packed Products Co., Inc. | 1/1950-10/1957; eliminated 7/1959 | | NAKINA |
| 7305 | PPCX | Peyton Packing Co. (Mather Stock Car Co.) | 1/1941-1/1943; 1/1945 (not listed) | | NAKINA |
| 7306 | PPCX | Peyton Packing Co. | 7/1930-4/1938 | | NAKINA |
| 7307 | PPCX | Peyton Packing Co. (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 7308 | PPCX | Perfect Packed Products Co., Inc. | 1/52-10/57; eliminated 7/59 | | NRHS |
| 7309 | PPCX | *PERFECT PACKED PRODUCTS CO. [PEYTON PACKING CO.] 9MATHER STOCK CAR CO.) | | | PWRC |
| 7310 | PPCX | *AAPRCO LIST OF PRIVATELY OWNED PASSENGER CARS & LOCOMOTIVE EQUIP. | | | PWRC |
| 7311 | PPCX | American Association of Private Railroad Car Owners (AAPRCO) | | | RSRV |
| 7312 | PPCX | PRIVATELY OWNED PASSENGER CARS & LO | | | SCAC4 |
| 7313 | PPCY | PAPER CITY TRANSPORT INC | | | SCAC3 |
| 7314 | PPCZ | POTLACH PAPER CO. | | | PWRC |
| 7315 | PPD | Personal Air Transport Ltd. | Callsign: Personal, Flights operated by Air Prague | M | AVCODES |
| 7316 | PPDA | PETROLEUM PRODUCTS LLC | | | SCAC4 |
| 7317 | PPDD | PROLOGIC PLRS DE MUZQUIZ S DE RL DE | | | SCAC4 |
| 7318 | PPDE | PRAIRIE PRIDE ENTERPRISES INC | | | SCAC4 |
| 7319 | PPDH | PAPAZIAN, RONALD & DONALD HARGIS | | | SCAC3 |
| 7320 | PPDI | PPD UHMW INDUSTRIES | | | SCAC4 |
| 7321 | PPDL | P.I.P. DELIVERY&COURIER SERVICE, INC | | | SCAC3 |
| 7322 | PPDL | PLANT PEDDLERS INC | | | SCAC4 |
| 7323 | PPDN | PACIFIC PRODUCE INC | | | SCAC4 |
| 7324 | PPDP | PROVIDENCE-PHILADELPHIA DISPATCH IN | | | SCAC3 |
| 7325 | PPDQ | PHOENIX-PDQ INC | | | SCAC4 |
| 7326 | PPDS | PACIFIC PARADISE SHIPPING INC | | | SCAC4 |
| 7327 | PPEA | PAPE, ART, TRANSFER INC | | | SCAC3 |
| 7328 | PPEB | PIN POINT ENTERPRISES INC | | | SCAC4 |
| 7329 | PPEG | PHARMALOGIC P E T SERVICES OF MONTR | | | SCAC4 |
| 7330 | PPEM | PIERCE PROMOTIONS AND EVENT MANAGEM | | | SCAC4 |
| 7331 | PPEO | PAPER PEOPLE | | | SCAC4 |
| 7332 | PPEQ | PURE PLAYAZZ ENTERPRISES INC | | | SCAC4 |
| 7333 | PPER | PAPPAS BUILDERS SUPPLY | | | SCAC4 |
| 7334 | PPES | P P E TRANSPORTATION SERVICE INC | | | SCAC3 |
| 7335 | PPET | PIPPERT TRUCKING | | | SCAC3 |
| 7336 | PPET | POWER PETROLEUM INC | | | SCAC4 |
| 7337 | PPEX | DYNERGY SERVICES PLUM POINT LLC | | | SCAC4 |
| 7338 | PPFC | PREMIER PACIFIC COACH LINES LTD | | | SCAC3 |
| 7339 | PPFC | PRO PACIFIC TRANSPORT/PRO PACIFIC F | | | SCAC4 |
| 7340 | PPFE | PPF EXPRESS TRUCKING INC | | | SCAC4 |
| 7341 | PPFI | POLY-PLAS FEED SCREWS INCORPORATED | | | SCAC4 |
| 7342 | PPFP | P P SHIPPING CO (HELLAS) S A | | | SCAC4 |
| 7343 | PPFQ | PACIFIC PROWLER FISHING LTD | | | SCAC4 |
| 7344 | PPFT | PRODUCTION PAINT FINISHERS INC | | | SCAC4 |
| 7345 | PPG | Phoenix Air Transport, Inc. | Callsign: Papago, | USA | AVCODES |
| 7346 | PPG | Phoenix Air Transport | | | ICAO1 |
| 7347 | PPG | PITTSBURGH PLATE GLASS (OHIO) | | | PWRC |
| 7348 | PPG | PPG Polifarb Cieszyn S.A. | | PL | VKM |
| 7349 | PPGB | PAPER TRANSPORT OF GREEN BAY INC | | | SCAC4 |
| 7350 | PPGF | POLAR TRANSPORT INC | | | SCAC4 |
| 7351 | PPGI | P P G INDUSTRIES INC | | | SCAC3 |
| 7352 | PPGI | PRIMA EXPRESS INC | | | SCAC4 |
| 7353 | PPGK | POPE, G K TRUCKING INC | | | SCAC4 |
| 7354 | PPGP | PENPAC GROUP INC | | | SCAC3 |
| 7355 | PPGU | ALTIVIA SPECIALTY CHEMICALS | | USA | BIC |
| 7356 | PPGU | Axiall Corporation | | | RSRV |
| 7357 | PPGU | PPG INDUSTRIES INC | | | SCAC4 |
| 7358 | PPGWW | PPG Deco Polska Sp. Z o.o. | | PL | VKM |
| 7359 | PPGX | PPG Industries, Inc. | added 4/1968; 4/1970-7/2005 | | NAKINA |
| 7360 | PPGX | Pittsburgh Plate Glass Co. | added 4/1961; 4/1961-10/1966; eliminated 4/1968 | | NAKINA |
| 7361 | PPGX | Columbia-Southern Chemical Corp. | 1/1952-10/1957; eliminated 4/1961 | | NAKINA |
| 7362 | PPGX | Pittsburgh Plate Glass Co., Columbia Chemical Div. | 7/1923; 1/1941-1/1950 | | NAKINA |
| 7363 | PPGX | Columbia-Southern Chemical Corp. | 1/52-10/57; eliminated 4/61 | | NRHS |
| 7364 | PPGX | Pittsburgh Plate Glass Co. | added 4/61; 4/61-10/66; eliminated 4/68 | | NRHS |
| 7365 | PPGX | PPG Industries, Inc. | added 4/68; 4/70-7/2000 | | NRHS |
| 7366 | PPGX | PPG INDUSTRIES, INC. {PITTSBURGH PLATE GLASS CO., COLUMBIA-SOUTHERN CHEMICAL DIV.] | | | PWRC |
| 7367 | PPGX | PPG Industries | | | RSRV |
| 7368 | PPGX | PITTSBURGH PLATE GLASS CO | | | SCAC3 |
| 7369 | PPGX | Pittsburgh Plate Glass Co. | | USA | TRAFFIC |
| 7370 | PPGZ | PITTSBURGH PLATE GLASS | | | PWRC |
| 7371 | PPH | Polizeihubschrauberstaffel Neidersachsen | Callsign: Police Phoenix, | D | AVCODES |
| 7372 | PPH | Polizeihibschrauberstaffel Neidersachsen | | | ICAO1 |
| 7373 | PPHI | PATTERSON, PHIL INC | | | SCAC3 |
| 7374 | PPHL | PHELPS, HEATHER LYNN | | | SCAC4 |
| 7375 | PPHN | PADFIELD PLUMBING & HEATING INC | | | SCAC4 |
| 7376 | PPHO | PIPHO TRANSPORTATION | | | SCAC3 |
| 7377 | PPHO | PIPHO FREIGHT TRANSPORTATION INC | | | SCAC4 |
| 7378 | PPHW | PEORIA, PEORIA HEIGHTS & WESTERN RAILROAD | | | PWRC |
| 7379 | PPHX | PCS Phosphate Co., Inc. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 7380 | PPHX | National Car Co. | 1/1950-7/1954; eliminated 10/1955 | | NAKINA |
| 7381 | PPHX | National Car Co. | Jan-52 | | NRHS |
| 7382 | PPHX | PCS Phosphate Co., Inc. | added 10/97; 7/2000 | | NRHS |
| 7383 | PPHX | *PEORIA, PEORIA HEIGHTS & WESTERN RAILROAD | | | PWRC |
| 7384 | PPHX | *NATIONAL CAR CO. | | | PWRC |
| 7385 | PPHX | +PCS PHOSPHATE COMPANY | | | PWRC |
| 7386 | PPHX | PCS Phosphate | | | RSRV |
| 7387 | PPHX | PCS PHOSPHATE COMPANY, INC. | | | SCAC4 |
| 7388 | PPIA | PIRO PAVING INC | | | SCAC4 |
| 7389 | PPIB | PLANTATION PETROLEUM INC | | | SCAC4 |
| 7390 | PPIC | PRESSURE PIPE INSPECTION COMPANY LT | | | SCAC4 |
| 7391 | PPIE | PIONEER PIPE INC | | | SCAC4 |
| 7392 | PPIF | PIONEER PACIFIC INC | | | SCAC4 |
| 7393 | PPIG | PRONTO PIG INC | | | SCAC3 |
| 7394 | PPIN | PRO TRANSPORTATION INC | | | SCAC3 |
| 7395 | PPIN | PEPIN LUMBER INC | | | SCAC4 |
| 7396 | PPIP | PRAIRIE PIPELINE CONTRACTORS INC | | | SCAC4 |
| 7397 | PPIU | PPI LINES LTD. | | | SCAC3 |
| 7398 | PPIV | PROUD PARENTS INVESTMENTS CO | | | SCAC4 |
| 7399 | PPIX | Pacific Petrochemicals, Inc. | eliminated 4/1970 | | NAKINA |
| 7400 | PPIX | Ashland Oil & Refining Co. | added 7/1968 | | NAKINA |
