| Termen/ Term | Nr. aparižii/ No. occurrences |
| OARJA | 1 |
| OBIRSA | 5 |
| OBIRSIA | 19 |
| OBIRSIA CLOSANI | 17 |
| OBIRSIA-CLOSANI | 2 |
| OBOGA | 138 |
| OBOGA:OT | 2 |
| OBREJA | 8 |
| OCLAD | 1 |
| OCLAND | 6 |
| OCNA DE SUS | 2 |
| OCNA SUGATAG | 35 |
| OCOLIS | 24 |
| ODOBESTI | 10 |
| OGRA | 1 |
| OGRADEAUA | 1 |
| OGRADINA | 1 |
| OGREDEAUA | 1 |
| OHABA | 2 |
| OHABA BISTRA | 1 |
| OINACU | 4 |
| OITUZ | 19 |
| OLARI | 12 |
| OLCEA | 2 |
| OLTENESTI | 9 |
| OLTINA | 95 |
| OLTINACT | 1 |
| ONEAGA | 1 |
| ONEASA | 1 |
| OPRISENI | 2 |
| OPTASI MAGURA | 1 |
| ORASTIOARA DE SUD | 1 |
| ORASTIOARA DE SUS | 34 |
| ORASU NOU | 46 |
| ORASUL NOU | 2 |
| ORBEASCA | 1 |
| ORBENI | 133 |
| ORBENI:BC | 1 |
| ORLAT | 28 |
| ORLEA | 26 |
| ORLESTI | 2 |
| ORMAN | 1 |
| ORSENI | 1 |
| ORSOVA | 3 |
| OSICA DE SUS | 5 |
| OSTRA | 29 |
| OSTROV | 17 |
| OSTROVENI | 4 |
| OSTROVUL MARE | 1 |
| OTESANI | 4 |