| Country Name | Sea Name | Number of Ports | * Introductions in Ports |
|---|---|---|---|
| Panama | Baltic Sea | ||
| Papua New Guinea | Baltic Sea | ||
| Peru | Baltic Sea | ||
| Philippines | Baltic Sea | ||
| Poland | Baltic Sea | 11 | 27 |
| Portugal | Baltic Sea | 13 | |
| Puerto Rico | Baltic Sea | ||
| Qatar | Baltic Sea | ||
| Reunion | Baltic Sea | ||
| Romania | Baltic Sea | ||
| Russia | Baltic Sea | 8 | |
| Saint Lucia | Baltic Sea | ||
| Saint Vincent and the Grenadines | Baltic Sea | ||
| Samoa | Baltic Sea | ||
| Sao Tome and Principe | Baltic Sea | ||
| Saudi Arabia | Baltic Sea | ||
| Senegal | Baltic Sea | ||
| Seychelles | Baltic Sea | ||
| Sierra Leone | Baltic Sea | ||
| Singapore | Baltic Sea |