| 9101 | PSSQ | PRAIRIE STATE SYSTEM | | | SCAC3 |
| 9102 | PSSQ | PORFIRIO SAUCEDA/ SANTA CRUZ | | | SCAC4 |
| 9103 | PSSS | PSSI | | | SCAC4 |
| 9104 | PSST | PASSIEU-STEWART TRUCKING | | | SCAC3 |
| 9105 | PSSU | PENTALVER TRANSPORT LIMITED | | GB | BIC |
| 9106 | PSSU | PENTALVER TRANSPORT LIMITED | | | SCAC4 |
| 9107 | PSSV | PALMETTO SHIPPING & STEVEDORING CO | | | SCAC3 |
| 9108 | PSSV | PIONEER SHIPMANAGEMENT SERVICES LLC | | | SCAC4 |
| 9109 | PSSW | PSS WAREHOUSING AND TRANSPORTATION | | | SCAC4 |
| 9110 | PSSX | SNOQUALMIE VALLEY RAILROAD [PUGET SOUND SNOQUALMIE VALLEY RAILROAD] | | | PWRC |
| 9111 | PSSY | PALM SPA & SUPPLY INC | | | SCAC4 |
| 9112 | PST | Parsa S.A. d/b/a Air Panama | IATA: 7P, Callsign: Turismo Regional, | PA | AVCODES |
| 9113 | PST | Airwork (New Zealand) Ltd. | IATA: HT, Callsign: Post, Designator HT recalled by IATA | NZ | AVCODES |
| 9114 | PST | Parsa | | | ICAO1 |
| 9115 | PST | Philadelphia Suburban Transportation | 1/1975-1/1980 | | NAKINA |
| 9116 | PST | Philadelphia Suburban Transportation | 1/75-1/80 | | NRHS |
| 9117 | PST | PHILADELPHIA SUBURBAN TRANSPORTATION | | | PWRC |
| 9118 | PST | Philadelphia Suburban Transportation Company | | USA | TRAFFIC |
| 9119 | PSTA | POSTEN TAXI INC | | | SCAC3 |
| 9120 | PSTA | PACIFIC SHORES TRUCKING & TRANSPORT | | | SCAC4 |
| 9121 | PSTB | Puget Sound Tug & Barge | 1/1975-1/1980 | | NAKINA |
| 9122 | PSTB | Puget Sound Tug & Barge | 1/75-1/80 | | NRHS |
| 9123 | PSTB | PUGET SOUND TUG & BARGE (PUGET SOUND NAVAL SHIP YARD) | | | PWRC |
| 9124 | PSTB | PRESTON TRANSPORTATION COMPANY | | | SCAC3 |
| 9125 | PSTC | POLE STAR TRANSPORT, INC | | | SCAC3 |
| 9126 | PSTC | POLE STAR TRANSPORT INC | | | SCAC4 |
| 9127 | PSTC | Philadelphia Suburban Transportation Company | | USA | TRAFFIC |
| 9128 | PSTD | P & S TRUCKING INC | | | SCAC3 |
| 9129 | PSTD | PST TRANSPORT | | | SCAC4 |
| 9130 | PSTE | P & S TRANSFER INC | | | SCAC3 |
| 9131 | PSTF | PORT STATES FREIGHT LINES INC | | | SCAC3 |
| 9132 | PSTG | P & S TRUCKING INC | | | SCAC3 |
| 9133 | PSTH | PHASE III TRUCKING INC | | | SCAC4 |
| 9134 | PSTJ | PRASSELL TRANSPORT INC | | | SCAC3 |
| 9135 | PSTK | PERNSTEINER TRUCKING INC | | | SCAC3 |
| 9136 | PSTL | PUGET SOUND TRUCK LINES, INC | | | SCAC3 |
| 9137 | PSTM | PHASE III MOVERS | | | SCAC4 |
| 9138 | PSTN | PRAIRIE STATES TERMINALS INC | | | SCAC4 |
| 9139 | PSTO | PORTSIDE TRANSPORTATION INC | | | SCAC3 |
| 9140 | PSTO | P & S TRANSPORTATION INC | | | SCAC4 |
| 9141 | PSTQ | POST TRUCKING INC | | | SCAC3 |
| 9142 | PSTR | PROSPECT TRANSPORTATION INC | | | SCAC4 |
| 9143 | PSTS | PUGET SOUND TRANSFER & STORAGE, Jayhawk Enterprises, INC | | | SCAC3 |
| 9144 | PSTS | PUGET SOUND TRANSFER & STORAGE | | | SCAC4 |
| 9145 | PSTT | POOHLI SIDHU TRANSPORT LTD | | | SCAC4 |
| 9146 | PSTT | Przedsiebiorstwo Spedycyjne Trade Trans Sp. Z.o.o. | | PL | VKM |
| 9147 | PSTU | TETRA PAK PACKAGING SOLUTIONS SPA | | I | BIC |
| 9148 | PSTV | P S T VANS INC | | | SCAC3 |
| 9149 | PSTV | PAUL AND SONS TRUCKING INC | | | SCAC4 |
| 9150 | PSTW | PRICE & SON TRUCKING | | | SCAC3 |
| 9151 | PSTX | The David J. Joseph Co. | added 10/2003; 7/2005 | | NAKINA |
| 9152 | PSTX | Joseph Transportation Inc. | added 4/2000; 7/2000; eliminated 10/2003 | | NAKINA |
| 9153 | PSTX | David J. Joseph Co. | added 4/1999; eliminated 4/2000 | | NAKINA |
| 9154 | PSTX | Georgia-Pacific Corp. | eliminated 10/1964 | | NAKINA |
| 9155 | PSTX | Puget Sound Pulp & Timber Co. | 1/1950-4/1961 | | NAKINA |
| 9156 | PSTX | Puget Sound Pulp & Timber Co. | 1/52-4/61 | | NRHS |
| 9157 | PSTX | David J. Joseph Co. | added 4/99; eliminated 4/2000 | | NRHS |
| 9158 | PSTX | Joseph Transportation Inc. | added 4/2000; 7/2000 | | NRHS |
| 9159 | PSTX | *GEORGIA-PACIFIC CORP. [PUGET SOUND PULP & TIMBER CO.] | | | PWRC |
| 9160 | PSTX | +DAVID J. JOSEPH CO. (JOSEPH TRANSPORTATION INC.) | | | PWRC |
| 9161 | PSTX | Joseph Transportation | | | RSRV |
| 9162 | PSTX | JOSEPH, DAVID J COMPANY, THE | | | SCAC4 |
| 9163 | PSU | Aeropeninsular, S.A. de C.V. | Callsign: Aeropeninsular, | MEX | AVCODES |
| 9164 | PSU | PHS Premium Aviation and Handling Services, Sociedada Unipessoal Lda | Callsign: Premium, | P | AVCODES |
| 9165 | PSUR | PACIFIC SOURCE INC | | | SCAC4 |
| 9166 | PSUT | PETROSOURCE TRANSPORTATION | | | SCAC3 |
| 9167 | PSUX | Pavers Supply Co. | added 4/1982; eliminated 10/1987 | | NAKINA |
| 9168 | PSUX | Shippers' Car Line Corp. | 4/1947 (not listed) | | NAKINA |
| 9169 | PSUX | Pennsylvania Sugar Co. | 7/1930-1/1946 | | NAKINA |
| 9170 | PSUX | Pennsylvania Sugar Co. | Apr-38 | | NRHS |
| 9171 | PSUX | Pavers Supply Co. | added 4/82; eliminated 10/87 | | NRHS |
| 9172 | PSUX | *PENNSYLVANIA SUGAR CO. (SHIPPERS' CAR LINE CORP.) | | | PWRC |
| 9173 | PSUX | *PAVERS SUPPLY CO. | | | PWRC |
| 9174 | PSV | Servicios Aereos Profesionales, S.A. | IATA: 5S, Callsign: Proservicios, IATA code changed from P2* | DOM | AVCODES |
| 9175 | PSV | Servicios Aereos Profesionales | | | ICAO1 |
| 9176 | PSVA | PERSONAL SERVICE VAN LINE | | | SCAC3 |
| 9177 | PSVA | PRO SERV TRUCKING | | | SCAC4 |
| 9178 | PSVC | PORT SERVICES COMPANY | | | SCAC3 |
| 9179 | PSVE | PERRYVILLE STAVE CO INC | | | SCAC3 |
| 9180 | PSVE | PERRYVILLE STAVE CO INC | | | SCAC4 |
| 9181 | PSVL | PRESIDENTIAL SERVICES LTD | | | SCAC3 |
| 9182 | PSVN | PRO SERVICES OF N M INC | | | SCAC3 |
| 9183 | PSVS | PAULS OIL SERVICE | | | SCAC4 |
| 9184 | PSVT | PASTOR, VICTOR TRUCKING | | | SCAC3 |
| 9185 | PSVT | PRO SERVICE TAPE & | | | SCAC4 |
| 9186 | PSVW | PETROLEUM SERVICE OF WORCESTER | | | SCAC4 |
| 9187 | PSW | Pskov State Aviation Enterprise | Callsign: Pskovavia, | RUS | AVCODES |
| 9188 | PSW | Pskovavia | | | ICAO1 |
| 9189 | PSWC | PENINSULA SAW COMPANY SALES AND SER | | | SCAC4 |
| 9190 | PSWD | PASSWORD TRUCKING LLC | | | SCAC4 |
| 9191 | PSWG | PEAK SWINE GENETICS INC | | | SCAC4 |
| 9192 | PSWP | PORTLAND STONE WARE PACKAGING INC | | | SCAC3 |
| 9193 | PSWP | PORTLAND STONE WARE PACKAGING INC | | | SCAC4 |
| 9194 | PSWR | Pennsylvania Southwestern R.R. Inc. | added 10/2003; eliminated 4/2004; added 4/2005; 7/2005 | | NAKINA |
| 9195 | PSWR | PENNSYLVANIA SOUTHWESTERN RAILROAD INC. | | | PWRC |
| 9196 | PSWR | PENNSYLVANI | | | SCAC4 |
| 9197 | PSWS | PITTS & SONS WRECKER SERVICE | | | SCAC3 |
| 9198 | PSX | Pacific Southwest Airlines, Inc. | Callsign: Smiley, | USA | AVCODES |
| 9199 | PSX | Pacific Southwest Airlines | IATA: PS | | ICAO1 |
| 9200 | PSX | Pierce & Stevens Chemical Corp. | added 4/1956; eliminated 7/1956 | | NAKINA |
