| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oulainen | city | Oulun Laani | Finland | 64.2666667 | 24.8 | 219 | 929 |
| Oulanka | city | Lapin Laani | Finland | 66.45 | 29 | 826 | 135 |
| Oulu | city | Oulun Laani | Finland | 65.0166667 | 25.4666667 | 49 | 17358 |
| Oulujoki | city | Oulun Laani | Finland | 65 | 25.55 | 59 | 18148 |
| Oulunkyla | city | Etela-Suomen Laani | Finland | 60.2313889 | 24.9666667 | 88 | 177742 |
| Oulunkylä | city | Etela-Suomen Laani | Finland | 60.2313889 | 24.9666667 | 88 | 177742 |
| Oulunsalo | city | Oulun Laani | Finland | 64.9333333 | 25.4166667 | 32 | 4589 |
| Oulunsuu | city | Oulun Laani | Finland | 65 | 25.5333333 | 65 | 16768 |
| Ounas | city | Oulun Laani | Finland | 64.2 | 27.3 | 426 | 243 |
| Ounasjoki | city | Lapin Laani | Finland | 66.8333333 | 25.4166667 | 390 | 159 |
| Ouninpohja | city | Lansi-Suomen Laani | Finland | 61.7666667 | 25 | 590 | 766 |
| Outakoski | city | Lapin Laani | Finland | 69.6 | 25.9666667 | 656 | 16 |
| Outakumpy | city | Ita-Suomen Laani | Finland | 62.7333333 | 29.0166667 | 341 | 1344 |
| Outamo | city | Etela-Suomen Laani | Finland | 60.2666667 | 23.9166667 | 95 | 3814 |
| Outer Elmos | city | Lansi-Suomen Laani | Finland | 60.0833333 | 22.4 | 49 | 711 |
| Outokoskenkoulo | city | Lapin Laani | Finland | 69.6 | 25.9666667 | 656 | 16 |
| Outokumpu | city | Ita-Suomen Laani | Finland | 62.7333333 | 29.0166667 | 341 | 1344 |
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