| City | Country Codes | Area Codes | Dialing Codes |
|---|
| North Bonneville | +1 | 509 | +1 509 |
| North Lakewood | +1 | 360 | +1 360 |
| Northport | +1 | 509 | +1 509 |
| Oak Harbor | +1 | 360 | +1 360 |
| Oakesdale | +1 | 509 | +1 509 |
| Oakville | +1 | 360 | +1 360 |
| Ocean Park | +1 | 360 | +1 360 |
| Ocean Shores | +1 | 360 | +1 360 |
| Odessa | +1 | 509 | +1 509 |
| Okanogan | +1 | 509 | +1 509 |
| Olalla | +1 | 253 | +1 253 |
| Olga | +1 | 360 | +1 360 |
| Olympia | +1 | 360 | +1 360 |
| Omak | +1 | 509 | +1 509 |
| Onalaska | +1 | 360 | +1 360 |
| Orcas | +1 | 360 | +1 360 |
| Orient | +1 | 509 | +1 509 |
| Orondo | +1 | 509 | +1 509 |
| Oroville | +1 | 509 | +1 509 |
| Orting | +1 | 253 or 360 | +1 253 or 360 |
| Othello | +1 | 509 | +1 509 |
| Otis Orchards | +1 | 509 | +1 509 |
| Outlook | +1 | 509 | +1 509 |
| Oysterville | +1 | 360 | +1 360 |
| Pacific | +1 | 253 | +1 253 |
| Pacific Beach | +1 | 360 | +1 360 |
| Packwood | +1 | 360 | +1 360 |
| Palisades | +1 | 509 | +1 509 |
| Palouse | +1 | 509 | +1 509 |
| Paradise Inn | +1 | 360 | +1 360 |
| Parker | +1 | 509 | +1 509 |
| Pasco | +1 | 509 | +1 509 |
| Pateros | +1 | 509 | +1 509 |
| Paterson | +1 | 509 | +1 509 |
| Pe Ell | +1 | 360 | +1 360 |
| Peshastin | +1 | 509 | +1 509 |
| Plymouth | +1 | 509 | +1 509 |
| Point Roberts | +1 | 360 | +1 360 |
| Pomeroy | +1 | 509 | +1 509 |
| Port Angeles | +1 | 360 | +1 360 |
| Port Gamble | +1 | 360 | +1 360 |
| Port Hadlock | +1 | 360 | +1 360 |
| Port Ludlow | +1 | 360 | +1 360 |
| Port Orchard | +1 | 253 or 360 | +1 253 or 360 |
| Port Townsend | +1 | 360 | +1 360 |
| Poulsbo | +1 | 360 | +1 360 |
| Prescott | +1 | 509 | +1 509 |
| Preston | +1 | 425 | +1 425 |
| Prosser | +1 | 509 | +1 509 |
| Pullman | +1 | 509 | +1 509 |
Others Dialing Codes, Country Codes and Area Codes
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