| PLACE NAME | TYPE |
| Olmedal ostatua | hostel |
| ONA ELECTRO-EROSI | company |
| ONA ELECTRO-EROSIÓN SA | company |
| Ormabarrua | natural area |
| Ormaganea soroa | cultivated land |
| Ormaondo soroa | cultivated land |
| Ormapea soroa | cultivated land |
| Ormasolo | |
| ORTIZ DE ZARATE SA | company |
| Ortuduia soroa | cultivated land |
