| 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 |