| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Olina | city | Valkas Rajons | Latvia | 57.62 | 25.85 | 160 | 158 |
| Oliņas | city | Valkas Rajons | Latvia | 57.62 | 25.85 | 160 | 158 |
| Olynya | city | Valkas Rajons | Latvia | 57.62 | 25.85 | 160 | 158 |
| Omuli | city | Valkas Rajons | Latvia | 57.92 | 25.75 | 275 | 534 |
| Omuļu Muiža | city | Valkas Rajons | Latvia | 57.92 | 25.75 | 275 | 534 |
| Otkari | city | Valkas Rajons | Latvia | 57.50 | 26.10 | 236 | 704 |