| Port Code | Port Name | Country |
| USPOQ | Polk Inlet | United States |
| USPOR | Pocono Manor | United States |
| USPOS | Polson | United States |
| USPOT | Pt Tampa | United States |
| USPOU | Poughkeepsie | United States |
| USPOV | Poynette | United States |
| USPOW | Pt Washington | United States |
| USPOX | Poca | United States |
| USPOY | Lovell-Powell Apt | United States |
| USPOY | Powell-Lovell Apt | United States |
| USPOZ | Pooler | United States |
| USPPA | Pampa | United States |
| USPPB | Pinellas Park | United States |
| USPPC | Prospect Creek | United States |
| USPPD | Camp Pendleton | United States |
| USPPE | Pipestone | United States |
| USPPF | Parsons | United States |
| USPPH | Pacific Palisades | United States |
| USPPI | Philippi | United States |
| USPPK | Prospect Park | United States |
| USPPL | Pleasant Plains | United States |
| USPPM | Pompano Beach | United States |
| USPPN | Prophetstown | United States |
| USPPO | Sparrows Point | United States |
| USPPR | Pt Providence | United States |
| USPPS | Pennsauken | United States |
| USPPT | Potsdam | United States |
| USPPV | Pt Protection | United States |
| USPPW | Paw Paw | United States |
| USPPY | Parsippany | United States |
| USPPZ | Point Pleasant | United States |
| USPQA | Piqua | United States |
| USPQB | Paton | United States |
| USPQC | Pomona | United States |
| USPQD | Portland | United States |
| USPQH | Peachtree City | United States |
| USPQI | Presque Isle | United States |
| USPQL | Pelican | United States |
| USPQM | Palm | United States |
| USPQN | Pequannock | United States |
| USPQQ | Penn Yan | United States |
| USPQR | Pageland | United States |
| USPQS | Pilot Station | United States |
| USPQT | Portal | United States |
| USPQU | Pico Rivera | United States |
| USPQV | Pahrump | United States |
| USPQW | Prescott | United States |
| USPQY | Perry | United States |
| USPQZ | Patten | United States |
| USPRA | Prairieville | United States |
| USPRB | Paso Robles | United States |
| USPRC | Prescott | United States |
| USPRD | Pt Reading | United States |
| USPRE | Presidio | United States |
| USPRF | Pt Johnson | United States |
| USPRG | Progreso | United States |
| USPRH | Preston | United States |
| USPRI | Perrine | United States |
| USPRJ | Pt Royal | United States |
| USPRK | Parkridge | United States |
| USPRL | Pt Oceanic | United States |
| USPRM | Paramus | United States |
| USPRN | Preston | United States |
| USPRO | Perry | United States |
| USPRP | Paris | United States |
| USPRQ | Powell | United States |
| USPRR | Perry | United States |
| USPRS | Point Roberts | United States |
| USPRT | Point Retreat | United States |
| USPRU | Prinsburg | United States |
| USPRV | Prattville | United States |
| USPRW | Prentice | United States |
| USPRX | Paris | United States |
| USPRY | Pt Blakely | United States |
| USPRZ | Prineville | United States |
| USPSA | Palisades Park | United States |
| USPSB | Bellefonte-Clearfield Apt | United States |
| USPSB | Clearfield-Bellefonte Apt | United States |
| USPSC | Pasco | United States |
| USPSD | Pasadena | United States |
| USPSE | Passaic | United States |
| USPSF | Pittsfield | United States |
| USPSG | Petersburg | United States |
| USPSH | Peshtigo | United States |
| USPSI | Potosi | United States |
| USPSJ | Port Saint Joe | United States |
| USPSK | Dublin | United States |
| USPSL | Pt San Luis | United States |
| USPSM | Portsmouth | United States |
| USPSN | Palestine | United States |
| USPSO | Preston | United States |
| USPSP | Palm Springs | United States |
| USPSR | Pottsboro | United States |
| USPSS | Presque Isle | United States |
| USPST | Peosta | United States |
| USPSV | Pottsville | United States |
| USPSW | Plainview | United States |
| USPSX | Palacios | United States |
| USPSY | Port Sulphur | United States |
| USPSZ | Parsons | United States |