| Postal Code | City | Community | County | State | latitude | longitude | Map |
|---|---|---|---|---|---|---|---|
| 89-100 | Olszewka | Gmina Nakło nad Notecią | Powiat nakielski | Kujawsko-Pomorskie | 53.155 | 17.5509 | Map |
| 89-412 | Olszewka | Sośno | Powiat sępoleński | Kujawsko-Pomorskie | 53.4341 | 17.6873 | Map |
| 06-430 | Olszewka | Gmina Sońsk | Powiat ciechanowski | Mazovia | 52.8223 | 20.7637 | Map |
| 07-402 | Olszewka | Gmina Lelis | Powiat ostrołęcki | Mazovia | 53.1368 | 21.4544 | Map |
| 06-323 | Olszewka | Jednorożec | Powiat przasnyski | Mazovia | 53.2129 | 21.0502 | Map |
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