Area Codes of selected cities in Poland.
Calling from USA dial:
011 + 48 + Area code (below) + Recipient's Phone Number in Poland.
| City | Area Code |
| Oborniki | 668 |
| Oborniki Śląskie | 71 |
| Obrzycko | 668 |
| Odolanów | 62 |
| Okonek | 67 665111 CR |
| Olecko | 116 |
| Olesno | 34 |
| Oleśnica | 71 |
| Olkusz | 35 |
| Olsztyn | 89 |
| Olsztynek | 89 |
| Oława | 71 |
| Opalenica | 666 |
| Opatów | 15 |
| Opoczno | 44 |
| Opole | 77 |
| Orneta | 55 436260 CR |
| Orneta | 55 436640 CR |
| Orla | 85 39 20 00 CR |
| Orzesze | 32 |
| Orzysz | 117 |
| Osieczna k. Leszna | 65 |
| Osiek | 69 |
| Ostrołęka | 29 |
| Ostroróg | 668 |
| Ostrowiec Świętokrzyski | 47 |
| Ostróda | 88 |
| Ostrów Lubelski | 836 51051 CR |
| Ostrów Mazowiecka | 217 |
| Ostrów Wlkp. | 62 |
| Ostrzeszów | 62 |
| Oświęcim | 33 |
| Otmuchów | 77 |
| Otwock | 22 |
| Ozimek | 77 |
| Ozorków | 42 |
| Ożarów | 15 |
| Ożarów Mazowiecki | 22 |
