Finland Postal Codes: O
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Places in Finland beginning with O — 57 entries. Larger towns link to their own page; smaller ones show their codes here.
| Place | Postal codes |
|---|---|
| Ohkola | 04530 |
| Ohtola | 34950 |
| Oijärvi | 95160 |
| Oikarainen | 97610 |
| Oitmäki | 02510 |
| Oitti | 12100, 12101 |
| Oittila | 41880 |
| Ojakkala | 03250 |
| Okkeri | 16160 |
| Oksakoski | 69920 |
| Oksava | 85820 |
| Olhava | 91140 |
| Ollila | 21560 |
| Onkamaa | 49780 |
| Onkamo | 82360 |
| Onkamojärvi | 98970 |
| Onkimaa | 07530 |
| Onkiniemi | 19230 |
| Ontojoki | 88640 |
| Onttola | 80510, 80511 |
| Orajärvi | 95750 |
| Orakylä | 99560 |
| Oravainen | 66800, 66801 |
| Oravaisten Tehdas | 66830 |
| Oravala | 45940 |
| Oravasaari | 41630 |
| Oravi | 58130 |
| Oravikoski | 71470 |
| Oravisalo | 82310 |
| Orimattila | 16300, 16301 |
| Oriniemi | 31810 |
| Oripää | 32500 |
| Orisberg | 61560 |
| Orismala | 61550 |
| Orisuo | 31960 |
| Orivesi | 35300, 35301 |
| Orivesi As | 35100 |
| Osara | 39230 |
| Oskola | 82160 |
| Otalampi | 03300 |
| Otamo | 29860 |
| Otanmäki | 88200, 88201 |
| Otava | 50670 |
| Oterma | 91720 |
| Oulainen | 86300, 86301 |
| Oulu | 36 codes |
| Oulun Kaupunki | 90015 |
| Oulunsalo | 90460, 90461 |
| Outokumpu | 83500, 83501 |
| Oxkangar | 66730 |
| Oys | 90029 |
| Öja | 68550 |
| Öllölä | 82750 |
| Österhankmo | 66560 |
| Övermalax | 66140, 66141 |
| Övermark | 64610 |
| Överpurmo | 68970 |
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