UpAlphabetical listing of Places in Finland
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Osa | city | Varsinais-Suomi | Finland | 60.78 | 22.45 | 278 | 529 |
| Osara | city | Birkaland | Finland | 61.70 | 23.17 | 242 | 600 |
| Osikonmaeki | city | Etela-Savo | Finland | 62.03 | 28.27 | 367 | 447 |
| Osikonmäki | city | Etela-Savo | Finland | 62.03 | 28.27 | 367 | 447 |
| Oskola | city | Norra Karelen | Finland | 62.42 | 30.50 | 830 | 295 |
| Oskolansalo | city | Norra Karelen | Finland | 62.38 | 30.50 | 830 | 327 |
| Osma | city | Lappi | Finland | 67.05 | 25.60 | 830 | 149 |
| Osmajaervi | city | Pohjois-Savo | Finland | 62.45 | 27.67 | 262 | 1697 |
| Osmajarvi | city | Pohjois-Savo | Finland | 62.45 | 27.67 | 262 | 1697 |
| Osmalahti | city | Varsinais-Suomi | Finland | 60.35 | 22.58 | 157 | 1098 |
| Osmalax | city | Varsinais-Suomi | Finland | 60.35 | 22.58 | 157 | 1098 |
| Osmanki | city | Pohjois-Savo | Finland | 63.72 | 26.48 | 364 | 447 |
| Osnas | city | Varsinais-Suomi | Finland | 60.52 | 21.25 | 0 | 149 |
| Ostanberg | city | Nyland | Finland | 59.95 | 22.97 | 3 | 173 |
| Ostenso | city | Pohjanmaa | Finland | 63.62 | 22.82 | 49 | 1145 |
| Osterandan | city | Pohjanmaa | Finland | 62.97 | 21.22 | 0 | 46 |
| Osterandan | city | Pohjanmaa | Finland | 63.18 | 21.30 | 3 | 91 |
| Osterby | city | Pohjanmaa | Finland | 63.33 | 22.53 | 98 | 596 |
| Osterby | city | Nyland | Finland | 60.12 | 23.72 | 75 | 2604 |
| Osterby | city | Nyland | Finland | 60.37 | 26.48 | 0 | 166 |
| Osterbygge | city | Aland | Finland | 59.93 | 20.98 | 3 | 165 |
| Ostergard | city | Varsinais-Suomi | Finland | 59.95 | 22.72 | 0 | 14 |
| Ostergard | city | Aland | Finland | 60.22 | 19.64 | 36 | 433 |
| Ostergranden | city | Pohjanmaa | Finland | 63.05 | 21.57 | 49 | 2126 |
| Osterlund | city | Aland | Finland | 60.07 | 20.10 | 59 | 1030 |
| Osterretais | city | Varsinais-Suomi | Finland | 60.17 | 21.67 | 68 | 239 |
| Osterskar | city | Varsinais-Suomi | Finland | 59.98 | 21.30 | 0 | 0 |
| Ostersundorn | city | Nyland | Finland | 60.26 | 25.19 | 16 | 32553 |
| Ostertaklax | city | Pohjanmaa | Finland | 62.72 | 21.25 | 42 | 596 |
| Osteryttermark | city | Pohjanmaa | Finland | 62.53 | 21.43 | 98 | 596 |
| Ostia Carelorum | city | Norra Karelen | Finland | 62.60 | 29.77 | 301 | 20316 |
| Ostra Centrum | city | Nyland | Finland | 60.21 | 25.09 | 3 | 126350 |
| Ostra Saverkeit | city | Varsinais-Suomi | Finland | 60.22 | 21.45 | 3 | 169 |
| Ostra Sidan | city | Pohjanmaa | Finland | 62.27 | 21.40 | 82 | 605 |
| Ostrabyugo | city | Aland | Finland | 59.93 | 20.98 | 3 | 165 |
| Ostronsaari | city | Norra Karelen | Finland | 62.50 | 31.15 | 830 | 149 |
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