| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Opoli | city | Ludzas Novads | Latvia | 56.41 | 28.16 | 400 | 2677 |
| Opuli | city | Ludzas Novads | Latvia | 56.41 | 28.16 | 400 | 2677 |
| Osava | city | Ludzas Novads | Latvia | 56.33 | 27.85 | 830 | 447 |
| Osinovka | city | Ludzas Novads | Latvia | 56.25 | 28.10 | 830 | 409 |
| Osova | city | Ludzas Novads | Latvia | 56.33 | 27.85 | 830 | 447 |
| Osvova | city | Ludzas Novads | Latvia | 56.33 | 27.85 | 830 | 447 |