| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oddzial | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Oddzial Nowy | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Oddzial Stary | city | Poland | 52.02 | 20.63 | 508 | 5648 | |
| Oddział | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Oddział Nowy | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Oddział Stary | city | Poland | 52.02 | 20.63 | 508 | 5648 | |
| Odzdzial | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Odzdział | city | Poland | 52.02 | 20.65 | 518 | 6028 | |
| Ojrzanow | city | Poland | 52.00 | 20.75 | 574 | 3753 | |
| Olsza | city | Poland | 51.82 | 19.85 | 643 | 4834 | |
| Olszewo | city | Poland | 51.78 | 19.90 | 577 | 4816 | |
| Olszowa Wola | city | Poland | 51.68 | 20.57 | 547 | 4140 | |
| Orla Góra | city | Poland | 51.83 | 20.55 | 646 | 4783 | |
| Orlow | city | Poland | 52.17 | 20.23 | 285 | 16233 | |
| Oryszew | city | Poland | 52.12 | 20.38 | 285 | 5103 | |
| Oryszew Nowy | city | Poland | 52.12 | 20.38 | 285 | 5103 | |
| Orłów | city | Poland | 52.17 | 20.23 | 285 | 16233 | |
| Osada Dolna | city | Poland | 51.75 | 20.25 | 551 | 21768 | |
| Osiek | city | Poland | 52.25 | 19.97 | 298 | 3500 | |
| Osiek Drugi | city | Poland | 52.25 | 19.97 | 298 | 3500 | |
| Osiek Pierwszy | city | Poland | 52.23 | 19.97 | 295 | 3079 | |
| Osiek Trzeci | city | Poland | 52.25 | 19.98 | 311 | 3520 | |
| Osiny | city | Poland | 52.15 | 20.48 | 269 | 4864 | |
| Osowiec | city | Poland | 52.03 | 20.65 | 429 | 7750 | |
| Ossa | city | Poland | 51.82 | 20.40 | 639 | 4465 | |
| Ossowice | city | Poland | 51.72 | 20.30 | 511 | 7587 | |
| Ostroleka Stroniewice | city | Poland | 51.98 | 19.80 | 426 | 5199 | |
| Ostrow | city | Poland | 52.10 | 19.85 | 242 | 5785 | |
| Ostrowiec | city | Poland | 52.03 | 20.27 | 367 | 2999 | |
| Ostrołęka Stroniewice | city | Poland | 51.98 | 19.80 | 426 | 5199 | |
| Osuchów | city | Poland | 51.90 | 20.60 | 620 | 5627 | |
| Oszkowice | city | Poland | 52.07 | 19.57 | 331 | 3366 | |
| Oszkowice Dworskie | city | Poland | 52.07 | 19.58 | 318 | 3319 | |
| Oszkowice Stare | city | Poland | 52.07 | 19.57 | 331 | 3366 | |
| Otolice | city | Poland | 52.12 | 19.88 | 242 | 15052 | |
| Otolice Bielawy | city | Poland | 52.10 | 19.88 | 236 | 17824 | |
| Otolice Dziadownia | city | Poland | 52.10 | 19.88 | 236 | 17824 | |
| Otolice Marcew | city | Poland | 52.12 | 19.90 | 236 | 30999 | |
| Otolice Podbielnia | city | Poland | 52.12 | 19.90 | 236 | 30999 | |
| Otolice Stara Wieś | city | Poland | 52.12 | 19.88 | 242 | 15052 |