| Pahang |
| Pakistan |
| Palau |
| Palawan |
| Palestine |
| Panama |
| Panama Canal |
| Papal State |
| Papua New Guinea |
| Papua, Western |
| Pará |
| Paraguay |
| Paraíba |
| Paraná |
| Paris Commune (1871) |
| Parma and Piacenza |
| Parthenopean Republic |
| Pasundan |
| Patiala |
| Pattani |
| Pennsylvania |
| Perak |
| Perlis |
| Pernambuco |
| Persia |
| Peru |
| Peru, South |
| Philippines |
| Piauí |
| Piombino |
| Pitcairn |
| Polish-Lithuanian Commonwealth |
| Poland |
| Polynesia (French) |
| Pontianak |
| Porbandar |
| Portugal |
| Poyais |
| Primorye |
| Prince Edward Island |
| Prussia |
| Puerto Rico |
| Puntland |