UpAlphabetical listing of Places in Mazowieckie
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Opactwo | city | Mazowieckie | Poland | 51.53 | 21.77 | 403 | 5088 |
| Opacz | city | Mazowieckie | Poland | 52.17 | 20.93 | 298 | 147994 |
| Opacz | city | Mazowieckie | Poland | 52.10 | 21.17 | 265 | 31117 |
| Opacz Duża | city | Mazowieckie | Poland | 52.18 | 20.92 | 298 | 175677 |
| Opacz Mala | city | Mazowieckie | Poland | 52.17 | 20.91 | 305 | 130145 |
| Opacz Mała | city | Mazowieckie | Poland | 52.17 | 20.91 | 305 | 130145 |
| Opacz Wielka | city | Mazowieckie | Poland | 52.18 | 20.92 | 298 | 175677 |
| Opaleniec | city | Mazowieckie | Poland | 53.29 | 20.92 | 830 | 2140 |
| Opatkowice | city | Mazowieckie | Poland | 51.61 | 21.52 | 393 | 15855 |
| Opatówiec | city | Mazowieckie | Poland | 52.62 | 19.94 | 830 | 4583 |
| Opechowo | city | Mazowieckie | Poland | 53.06 | 21.79 | 390 | 2151 |
| Opilki | city | Mazowieckie | Poland | 53.25 | 20.73 | 830 | 2065 |
| Opinogora | city | Mazowieckie | Poland | 52.91 | 20.72 | 830 | 2073 |
| Opinogóra Dolna | city | Mazowieckie | Poland | 52.92 | 20.71 | 830 | 4821 |
| Opinogóra Górna | city | Mazowieckie | Poland | 52.91 | 20.72 | 830 | 2580 |
| Opinogóry | city | Mazowieckie | Poland | 52.91 | 20.72 | 830 | 2073 |
| Opiłki | city | Mazowieckie | Poland | 53.25 | 20.73 | 830 | 2065 |
| Opochowo | city | Mazowieckie | Poland | 53.06 | 21.79 | 390 | 2151 |
| Opole Nowe | city | Mazowieckie | Poland | 52.18 | 22.18 | 830 | 19078 |
| Opole Stare | city | Mazowieckie | Poland | 52.17 | 22.17 | 830 | 9588 |
| Opożdżew | city | Mazowieckie | Poland | 51.76 | 21.09 | 830 | 6944 |
| Oppatsch | city | Mazowieckie | Poland | 52.18 | 20.92 | 298 | 175677 |
| Opypy | city | Mazowieckie | Poland | 52.09 | 20.68 | 357 | 29744 |
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