| Název | Obyvatele | Nad. výška | Souřadnice | 
| Ocretti | 
 | 192 m | 45°6' N; 13°48' E | 
| Oipiani | 
 | 79 m | 45°24' N; 13°35' E | 
| Okorusica | 
 | 336 m | 45°27' N; 13°44' E | 
| Okreti | 
 | 192 m | 45°6' N; 13°48' E | 
| Olmeto Di Bogliuno | 
 | 739 m | 45°19' N; 14°9' E | 
| Olmeto | 
 | 743 m | 45°27' N; 14°0' E | 
| Opatija (Opatija) | 7 888 | 108 m | 45°19' N; 13°56' E | 
| Oprtalj | 
 | 198 m | 45°22' N; 13°49' E | 
| Orbanici | 
 | 232 m | 45°0' N; 13°55' E | 
| Orbani | 
 | 232 m | 45°0' N; 13°55' E | 
| Orihi | 
 | 320 m | 45°4' N; 13°56' E | 
| Orsera | 
 | 11 m | 45°8' N; 13°36' E | 
| Oscurus Di Sopra | 
 | 336 m | 45°27' N; 13°44' E | 
| Oscurus | 
 | 336 m | 45°27' N; 13°44' E | 
| Oskorus | 
 | 336 m | 45°27' N; 13°44' E | 
| Oskurus | 
 | 336 m | 45°27' N; 13°44' E | 
| Krok zpět, Ukázat kontinenty ... | 
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