| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Oaxaca | city | Estado de Baja California | Mexico | 32.3494444 | -115.1811111 | 45 | 574 |
| Obispo | city | Estado de Baja California | Mexico | 24.7666667 | -111.1 | 793 | 1275 |
| Ojeda | city | Estado de Baja California | Mexico | 32.0316667 | -116.7144444 | 1312 | 743 |
| Ojo de Agua | city | Estado de Baja California | Mexico | 31.35 | -116.25 | 390 | 770 |
| Ojos Negros | city | Estado de Baja California | Mexico | 31.8666667 | -116.2666667 | 2372 | 761 |
| Olivares Mexicanos | city | Estado de Baja California | Mexico | 32.0494444 | -116.6147222 | 1122 | 761 |
| Olivares Mexicanos | city | Estado de Baja California | Mexico | 32.0675 | -116.6116667 | 1105 | 761 |
| Olivia | city | Estado de Baja California | Mexico | 32.0838889 | -115.9711111 | 5334 | 7459 |
| Onyx | city | Estado de Baja California | Mexico | 29.9833333 | -114.9 | 1961 | 778 |
| Oribe de Alba | city | Estado de Baja California | Mexico | 32.6555556 | -114.8558333 | 131 | 802 |
| Orive Alva | city | Estado de Baja California | Mexico | 32.6555556 | -114.8558333 | 131 | 802 |
| Oro Blanco | city | Estado de Baja California | Mexico | 32.3833333 | -116.05 | 4625 | 22495 |
| Otilia | city | Estado de Baja California | Mexico | 28.1 | -113.6 | 820 | 795 |
| Oviedo Mota | city | Estado de Baja California | Mexico | 32.0225 | -115.0688889 | 16 | 585 |