| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Odkarby | city | Ahvenanmaan Laani | Finland | 60.3 | 19.9833333 | 19 | 995 |
| Ofverby | city | Ahvenanmaan Laani | Finland | 60.15 | 19.9833333 | 141 | 5727 |
| Ollas | city | Ahvenanmaan Laani | Finland | 60.0491667 | 20.4894444 | 32 | 209 |
| Olofsnas | city | Ahvenanmaan Laani | Finland | 60.3552778 | 19.8336111 | 19 | 451 |
| Olofsnäs | city | Ahvenanmaan Laani | Finland | 60.3552778 | 19.8336111 | 19 | 451 |
| Omkarby | city | Ahvenanmaan Laani | Finland | 60.2111111 | 19.8855556 | 6 | 1215 |
| Omnes | city | Ahvenanmaan Laani | Finland | 60.2166667 | 19.9833333 | 59 | 1096 |
| Oningeby | city | Ahvenanmaan Laani | Finland | 60.1166667 | 20.0166667 | 32 | 1716 |
| Onningby | city | Ahvenanmaan Laani | Finland | 60.1166667 | 20.0166667 | 32 | 1716 |
| Onningeby | city | Ahvenanmaan Laani | Finland | 60.1166667 | 20.0166667 | 32 | 1716 |
| Ora | city | Ahvenanmaan Laani | Finland | 60.2772222 | 19.5905556 | 3 | 321 |
| Orliden | city | Ahvenanmaan Laani | Finland | 60.2152778 | 19.685 | 0 | 554 |
| Ostanaker | city | Ahvenanmaan Laani | Finland | 60.2061111 | 19.9025 | 36 | 1741 |
| Osterbuggo | city | Ahvenanmaan Laani | Finland | 59.9333333 | 20.9833333 | 3 | 182 |
| Osterbygge | city | Ahvenanmaan Laani | Finland | 59.9333333 | 20.9833333 | 3 | 182 |
| Ostergard | city | Ahvenanmaan Laani | Finland | 60.2175 | 19.635 | 36 | 462 |
| Ostergard | city | Ahvenanmaan Laani | Finland | 60.1847222 | 19.8336111 | 19 | 1323 |
| Ostergard | city | Ahvenanmaan Laani | Finland | 60.0222222 | 19.9988889 | 0 | 1802 |
| Ostergeta | city | Ahvenanmaan Laani | Finland | 60.3833333 | 19.8833333 | 59 | 386 |
| Osterkalmare | city | Ahvenanmaan Laani | Finland | 60.1302778 | 19.9958333 | 72 | 5727 |
| Osterlund | city | Ahvenanmaan Laani | Finland | 60.0636111 | 20.1013889 | 59 | 638 |
| Ostra Mangsjo | city | Ahvenanmaan Laani | Finland | 60.1883333 | 19.5936111 | 6 | 428 |
| Ostra Ytternas | city | Ahvenanmaan Laani | Finland | 60.0830556 | 19.9627778 | 0 | 6575 |
| Ostrabyugo | city | Ahvenanmaan Laani | Finland | 59.9333333 | 20.9833333 | 3 | 182 |
| Overboda | city | Ahvenanmaan Laani | Finland | 59.9333333 | 20.9 | 3 | 197 |
| Overby | city | Ahvenanmaan Laani | Finland | 60.2166667 | 19.6333333 | 36 | 462 |
| Overby | city | Ahvenanmaan Laani | Finland | 60.15 | 19.9833333 | 141 | 5727 |
| Overgard | city | Ahvenanmaan Laani | Finland | 60.1875 | 19.7577778 | 16 | 891 |
| Overo | city | Ahvenanmaan Laani | Finland | 60.1 | 20.5166667 | 0 | 133 |
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