| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obory | city | Poland | 52.05 | 17.85 | 305 | 4033 | |
| Obra Nowa | city | Poland | 51.87 | 17.45 | 472 | 8722 | |
| Obra Stara | city | Poland | 51.88 | 17.45 | 485 | 9150 | |
| Ochędzyn | city | Poland | 51.30 | 18.27 | 590 | 5478 | |
| Ociaz | city | Poland | 51.72 | 17.93 | 433 | 8256 | |
| Odolanów | city | Poland | 51.57 | 17.70 | 390 | 7499 | |
| Okole | city | Poland | 51.42 | 17.83 | 629 | 6916 | |
| Okon | city | Poland | 51.38 | 18.25 | 521 | 3737 | |
| Olendry | city | Poland | 51.42 | 18.30 | 531 | 3307 | |
| Olesie | city | Poland | 51.88 | 17.58 | 465 | 7543 | |
| Olesiec | city | Poland | 51.97 | 17.90 | 308 | 6542 | |
| Olesiec Nowy | city | Poland | 51.98 | 17.90 | 321 | 6026 | |
| Olesiec Stary | city | Poland | 51.97 | 17.88 | 298 | 7108 | |
| Olobok | city | Poland | 51.63 | 18.07 | 416 | 4290 | |
| Olszowa | city | Poland | 51.30 | 18.07 | 590 | 13496 | |
| Olszyna | city | Poland | 51.42 | 17.92 | 738 | 9421 | |
| Opatow | city | Poland | 51.22 | 18.15 | 554 | 5598 | |
| Opatowiec | city | Poland | 51.23 | 18.10 | 570 | 6298 | |
| Opatówek | city | Poland | 51.73 | 18.23 | 452 | 6981 | |
| Orlina | city | Poland | 52.05 | 17.92 | 308 | 3757 | |
| Orlina Duża | city | Poland | 52.07 | 17.92 | 301 | 3781 | |
| Orlina Mala | city | Poland | 52.05 | 17.92 | 308 | 3757 | |
| Orlina Mała | city | Poland | 52.05 | 17.92 | 308 | 3757 | |
| Orpiszew | city | Poland | 51.72 | 17.62 | 472 | 4726 | |
| Osada Buczek Maly | city | Poland | 51.12 | 17.97 | 666 | 4415 | |
| Osada Buczek Mały | city | Poland | 51.12 | 17.97 | 666 | 4415 | |
| Osada Gola | city | Poland | 51.97 | 17.25 | 357 | 4731 | |
| Osada Remiszowka | city | Poland | 51.20 | 17.90 | 649 | 4708 | |
| Osiek | city | Poland | 51.37 | 18.20 | 518 | 5601 | |
| Osiek | city | Poland | 52.02 | 17.43 | 282 | 8989 | |
| Osiek Drugi | city | Poland | 52.00 | 17.45 | 311 | 14212 | |
| Osiek Pierwszy | city | Poland | 52.02 | 17.43 | 282 | 8989 | |
| Osiny | city | Poland | 51.30 | 17.97 | 551 | 12795 | |
| Osiny | city | Poland | 51.37 | 17.92 | 708 | 9278 | |
| Osowa | city | Poland | 51.32 | 18.22 | 564 | 7040 | |
| Ostrov | city | Poland | 51.65 | 17.82 | 456 | 78845 | |
| Ostrow | city | Poland | 51.93 | 18.33 | 505 | 4372 | |
| Ostrow | city | Poland | 51.65 | 17.82 | 456 | 78845 | |
| Ostrow Kaliski | city | Poland | 51.55 | 18.22 | 485 | 3846 | |
| Ostrow Wielkopolski | city | Poland | 51.65 | 17.82 | 456 | 78845 | |
| Ostrowiec | city | Poland | 51.32 | 18.05 | 610 | 14990 | |
| Ostrycharze | city | Poland | 51.37 | 18.38 | 518 | 4147 | |
| Ostrzeszow | city | Poland | 51.42 | 17.95 | 708 | 9129 | |
| Ostrzeszow Pustkowie | city | Poland | 51.43 | 17.97 | 666 | 8332 | |
| Ostrzeszow Szyszki | city | Poland | 51.43 | 17.97 | 666 | 8332 | |
| Ostrówek | city | Poland | 51.90 | 18.15 | 439 | 6320 | |
| Ostrówek | city | Poland | 51.37 | 18.30 | 538 | 3809 | |
| Osuchów | city | Poland | 51.80 | 18.32 | 485 | 6483 | |
| Osusz | city | Poland | 51.68 | 17.40 | 459 | 17363 | |
| Oszczeklin | city | Poland | 51.75 | 18.35 | 521 | 6388 | |
| Osów | city | Poland | 51.32 | 18.22 | 564 | 7040 | |
| Ołobok | city | Poland | 51.63 | 18.07 | 416 | 4290 |