| Termen/ Term | Nr. apariții/ No. occurrences |
| OMISIEN | 2 |
| OMSK | 1 |
| ONETANGI | 1 |
| ONGUIDAI | 1 |
| ONOFRE | 3 |
| ONTARIO | 8 |
| ONTARIO (ZONA) | 1 |
| ONTARIO LENNON | 2 |
| OOSTVOORNE | 1 |
| OPROIU | 2 |
| ORAN | 1 |
| ORASUL BICAZ | 1 |
| ORATAVA | 1 |
| ORIJARVI | 3 |
| ORIJORVI | 1 |
| OROTAVA | 1 |
| OROTOVA | 1 |
| ORSK | 1 |
| ORSTOM | 2 |
| OSAKA | 10 |
| OSHIMA | 1 |
| OST-TURKESTAN | 2 |
| OSTROM | 3 |
| OSTROV | 1 |
| OSUCHOWA NOWA | 1 |
| OT | 19 |
| OTARU | 4 |
| OUA GUINEE | 1 |
| OVIFAK | 2 |
| OXOFORD | 1 |
| OZERKI-OSSA | 1 |
| P:CALDARUSANI | 1 |
| P:PIATRA NEANT | 1 |
| PACHISTAN | 1 |
| PACHO | 1 |
| PADANG | 1 |
| PADIS | 2 |
| PADURE NEGURENI BANEASA | 1 |
| PADUREA ANDRONACHE | 5 |
| PADUREA BABADAG | 2 |
| PADUREA BOGATA | 1 |
| PADUREA DEALUL BOBULUI | 2 |
| PADUREA LETEA | 2 |
| PADUREA NEAGRA | 1 |
| PADUREA NICULITEL | 1 |
| PADUREA RIIOASA | 1 |
| PADUREA RUGEGE | 1 |
| PADURI DE CONIFERE(S.U.A) | 1 |
| PADURI ESENTE AMESTECATE | 2 |
| PAHANG | 4 |