| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ondzuļi | city | Preilu Rajons | Latvia | 56.32 | 26.80 | 531 | 1047 |
| Ontskuli | city | Preilu Rajons | Latvia | 56.30 | 26.45 | 305 | 697 |
| Opoli | city | Preilu Rajons | Latvia | 56.52 | 26.72 | 380 | 674 |
| Opolie | city | Preilu Rajons | Latvia | 56.52 | 26.72 | 380 | 674 |
| Orisi | city | Preilu Rajons | Latvia | 56.42 | 26.68 | 396 | 822 |
| Ozoliņi | city | Preilu Rajons | Latvia | 56.43 | 26.67 | 380 | 831 |