UpAlphabetical listing of Places in Guanacaste
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Obandito | city | Guanacaste | Costa Rica | 10.51 | -85.66 | 206 | 6705 |
| Obispo | city | Guanacaste | Costa Rica | 10.15 | -85.40 | 830 | 4917 |
| Ochoa | city | Guanacaste | Costa Rica | 10.18 | -85.12 | 85 | 2301 |
| Ocotal | city | Guanacaste | Costa Rica | 10.54 | -85.72 | 318 | 3680 |
| Ojo de Agua | city | Guanacaste | Costa Rica | 10.17 | -85.40 | 314 | 4917 |
| Ojochal | city | Guanacaste | Costa Rica | 10.45 | -85.60 | 216 | 6638 |
| Ora | city | Guanacaste | Costa Rica | 9.87 | -85.45 | 0 | 2752 |
| Oriente | city | Guanacaste | Costa Rica | 10.28 | -85.52 | 223 | 4644 |
| Ortega | city | Guanacaste | Costa Rica | 10.36 | -85.46 | 22 | 5275 |
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