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| Oak Creek (historical) | Douglas |
| Oak Creek Post Office (historical) | Douglas |
| Oak Grove | Hood River |
| Oak Grove | Clackamas |
| Oak Grove Census Designated Place | Clackamas |
| Oak Grove Post Office | Clackamas |
| Oak Grove Post Office (historical) | Josephine |
| Oak Hills | Washington |
| Oak Hills Census Designated Place | Washington |
| Oak Park | Marion |
| Oak Post Office (historical) | Coos |
| Oakdale | Polk |
| Oakdale Post Office (historical) | Josephine |
| Oakland | Douglas |
| Oakland Post Office | Douglas |
| Oaklawn | Clackamas |
| Oakley Post Office (historical) | Harney |
| Oakridge | Lane |
| Oakridge Post Office | Lane |
| Oaks | Douglas |
| Oakville Post Office (historical) | Linn |
| Oasis Post Office (historical) | Gilliam |
| Oatfield | Clackamas |
| Oatfield Census Designated Place | Clackamas |
| O'Brien | Josephine |
| O'Brien Census Designated Place | Josephine |
| O'Brien Post Office | Josephine |
| Ocean Park | Lincoln |
| Oceanlake | Lincoln |
| Oceanside | Tillamook |
| Oceanside Census Designated Place | Tillamook |
| Oceanside Post Office | Tillamook |
| Oceola Post Office (historical) | Washington |
| Ochoco Post Office (historical) | Crook |
| Odell | Hood River |
| Odell Census Designated Place | Hood River |
| Odell Lake | Klamath |
| Odell Post Office | Hood River |
| Odessa Post Office (historical) | Klamath |
| Oklahoma Hill | Clatsop |
| Olalla | Douglas |
| Olalla Post Office (historical) | Douglas |
| Old Colton | Clackamas |
| Old Town | Douglas |
| Olden Post Office (historical) | Baker |
| Olene | Klamath |
| Olene Post Office (historical) | Klamath |
| Olete Post Office (historical) | Klamath |
| Olex | Gilliam |
| Olex Post Office (historical) | Gilliam |
| Olney | Clatsop |
| Olney Post Office (historical) | Clatsop |
| Omro Post Office (historical) | Lane |
| Ona | Lincoln |
| Ona Post Office (historical) | Lincoln |
| Oneatta Post Office (historical) | Lincoln |
| O'Neil Corners | Clackamas |
| O'Neil Post Office (historical) | Crook |
| Oneonta Post Office (historical) | Multnomah |
| Onion Peak Post Office (historical) | Tillamook |
| Ontario | Malheur |
| Ontario Heights | Malheur |
| Ontario Post Office | Malheur |
| Opal City | Jefferson |
| Opal City Post Office (historical) | Jefferson |
| Ophir | Curry |
| Ophir Post Office | Curry |
| Ord Post Office (historical) | Lane |
| Ordnance (historical) | Umatilla |
| Ordnance Post Office (historical) | Umatilla |
| Oregon Caves Post Office (historical) | Josephine |
| Oregon City | Clackamas |
| Oregon City Post Office | Clackamas |
| Orenco | Washington |
| Orenco Post Office (historical) | Washington |
| Oretech Post Office | Klamath |
| Oretown | Tillamook |
| Oretown Post Office (historical) | Tillamook |
| Orient | Multnomah |
| Orient Post Office (historical) | Multnomah |
| Orodell Post Office (historical) | Union |
| Oroville Post Office (historical) | Harney |
| Orseco Post Office (historical) | Lane |
| Ortley | Wasco |
| Ortley Post Office (historical) | Wasco |
| Orville Post Office (historical) | Clackamas |
| Othello Post Office (historical) | Lane |
| Otis | Lincoln |
| Otis Post Office | Lincoln |
| Otter Rock | Lincoln |
| Otter Rock Post Office | Lincoln |
| Owens Post Office (historical) | Tillamook |
| Owyhee | Malheur |
| Owyhee Ferry Post Office (historical) | Malheur |
| Owyhee Post Office (historical) | Malheur |
| Owyhee Post Office (historical) | Malheur |
| Oxbow | Baker |
| Oxbow (historical) | Baker |
| Oxbow Post Office | Baker |
| Oysterville | Lincoln |
| Pacific City | Tillamook |
| Pacific City Census Designated Place | Tillamook |
| Pacific City Post Office | Tillamook |
| Pacific Palisades | Lincoln |
| Page Post Office (historical) | Multnomah |
| Paisley | Lake |
| Paisley Post Office | Lake |
| Palestine Post Office (historical) | Multnomah |
| Palmer Junction Post Office (historical) | Union |
| Palmer Post Office (historical) | Benton |
| Palmer Post Office (historical) | Multnomah |
| Palos Post Office (historical) | Linn |
| Panther Post Office (historical) | Lane |
| Paradise | Wallowa |
| Paradise Park | Clackamas |
| Paradise Post Office (historical) | Wallowa |
| Paramount Post Office (historical) | Lane |
| Paris | Lane |
| Paris (historical) | Malheur |
| Paris Post Office (historical) | Lane |
| Park Place | Clackamas |
| Park Place Post Office (historical) | Clackamas |
| Parkdale | Hood River |
| Parkdale Census Designated Place | Hood River |
| Parkdale Post Office (historical) | Hood River |
| Parker | Polk |
| Parker Post Office (historical) | Polk |
| Parkers Mills Post Office (historical) | Morrow |
| Parkersburg | Coos |
| Parkersburgh Post Office (historical) | Coos |
| Parkersville (historical) | Baker |
| Parkersville Post Office (historical) | Marion |
| Parkersville Post Office (historical) | Baker |
| Parkrose | Multnomah |
| Parkrose Post Office | Multnomah |
| Parkwood Post Office (historical) | Multnomah |
| Pass Creek Post Office (historical) | Douglas |
| Pattersons Mills Post Office (historical) | Douglas |
| Patton | Washington |
| Paulina | Crook |
| Paulina Post Office | Crook |
| Pawn Post Office (historical) | Lane |
| Payn Post Office (historical) | Clackamas |
| Paynesville Post Office (historical) | Clackamas |
| Peak (historical) | Benton |
| Peak Post Office (historical) | Washington |
| Peak Post Office (historical) | Benton |
| Pebble Post Office (historical) | Columbia |
| Peck | Douglas |
| Peck Post Office (historical) | Douglas |
| Pedee | Polk |
| Pedee Post Office (historical) | Polk |
| Pedro Post Office (historical) | Baker |
| Peel | Douglas |
| Peel Post Office (historical) | Douglas |
| Pelican City | Klamath |
| Pendair Heights | Umatilla |
| Pendleton | Umatilla |
| Pendleton Field Post Office (historical) | Umatilla |
| Pendleton Post Office | Umatilla |
| Pengra Post Office (historical) | Deschutes |
| Pengra Post Office (historical) | Lane |
| Peninsular Post Office (historical) | Multnomah |
| Penola Post Office (historical) | Grant |
| Peoria | Linn |
| Peoria Census Designated Place | Linn |
| Peoria Post Office (historical) | Linn |
| Perdue (historical) | Douglas |
| Perdue Post Office (historical) | Douglas |
| Perham Post Office (historical) | Crook |
| Peris Post Office (historical) | Columbia |
| Perry | Union |
| Perry Post Office (historical) | Union |
| Perrydale | Polk |
| Perrydale (historical) | Jackson |
| Perrydale Post Office (historical) | Polk |
| Persist (historical) | Jackson |
| Persist Post Office (historical) | Jackson |
| Petersburg | Wasco |
| Peyton Post Office (historical) | Jackson |
| Phillips Post Office (historical) | Washington |
| Philomath | Benton |
| Philomath Post Office | Benton |
| Phoenix | Jackson |
| Phoenix Post Office | Jackson |
| Piedmont | Multnomah |
| Piedmont Post Office | Multnomah |
| Pilot Rock | Umatilla |
| Pilot Rock Post Office | Umatilla |
| Pine | Baker |
| Pine City | Morrow |
| Pine Creek | Baker |
| Pine Grove | Klamath |
| Pine Grove | Hood River |
| Pine Grove | Wasco |
| Pine Grove Census Designated Place | Wasco |
| Pine Grove Post Office (historical) | Washington |
| Pine Grove Post Office (historical) | Umatilla |
| Pine Hollow | Wasco |
| Pine Hollow Census Designated Place | Wasco |
| Pine Post Office (historical) | Linn |
| Pine Post Office (historical) | Baker |
| Pine Ridge Post Office (historical) | Klamath |
| Pinehurst | Jackson |
| Pinehurst Post Office (historical) | Jackson |
| Piney Post Office (historical) | Lane |
| Pioneer | Lincoln |
| Pioneer City (historical) | Lincoln |
| Pioneer City Post Office (historical) | Lincoln |
| Pioneer Post Office | Multnomah |
| Pioneer Post Office (historical) | Jackson |
| Pioneer Post Office (historical) | Lincoln |
| Pistol River | Curry |
| Pistol River Census Designated Place | Curry |
| Pistol River Post Office | Curry |
| Pitner Post Office (historical) | Tillamook |
| Pittsburg | Columbia |
| Pittsburg Post Office (historical) | Columbia |
| Pivot Post Office (historical) | Columbia |
| Pix Post Office (historical) | Baker |
| Placer | Josephine |
| Placer Post Office (historical) | Josephine |
| Plainview (historical) | Multnomah |
| Plainview Post Office (historical) | Linn |
| Plano Post Office (historical) | Baker |
| Pleasant Hill | Lane |
| Pleasant Hill Post Office | Lane |
| Pleasant Home | Multnomah |
| Pleasant Home Post Office (historical) | Multnomah |
| Pleasant Valley | Baker |
| Pleasant Valley | Josephine |
| Pleasant Valley | Tillamook |
| Plevna (historical) | Klamath |
| Plevna Post Office (historical) | Klamath |
| Plum Trees | Curry |
| Plum Valley Post Office (historical) | Polk |
| Plush | Lake |
| Plush Census Designated Place | Lake |
| Plush Post Office | Lake |
| Pocahontas (historical) | Baker |
| Pocahontas Post Office (historical) | Baker |
| Point Terrace | Lane |
| Point Terrace Post Office (historical) | Lane |
| Pokegama (historical) | Klamath |
| Pokegama Post Office (historical) | Klamath |
| Polk Post Office (historical) | Polk |
| Polk Post Office (historical) | Polk |
| Pompeii Post Office (historical) | Clackamas |
| Pondosa | Union |
| Pondosa Post Office (historical) | Union |
| Pony Village Post Office (historical) | Coos |
| Poplar Post Office (historical) | Wheeler |
| Port Clatsop Post Office (historical) | Clatsop |
| Port Orford | Curry |
| Port Orford Post Office | Curry |
| Porter Creek | Douglas |
| Porterville (historical) | Grant |
| Porterville Post Office (historical) | Lake |
| Portland | Multnomah |
| Portland Air Base Post Office (historical) | Multnomah |
| Portland Division (historical) | Multnomah |
| Portland Heights | Multnomah |
| Portland Post Office | Multnomah |
| Portland Zoo Railway Post Office (historical) | Multnomah |
| Post | Crook |
| Post Post Office | Crook |
| Potter Mill (historical) | Klamath |
| Powell Butte | Crook |
| Powell Butte Post Office | Crook |
| Powell Valley | Multnomah |
| Powell Valley Post Office (historical) | Multnomah |
| Powellhurst | Multnomah |
| Powellhurst Post Office (historical) | Multnomah |
| Power City | Umatilla |
| Powers | Coos |
| Powers Post Office | Coos |
| Powwatka Post Office (historical) | Wallowa |
| Prairie City | Grant |
| Prairie City Post Office | Grant |
| Prairie Creek Post Office (historical) | Wallowa |
| Pratum | Marion |
| Pratum Post Office (historical) | Marion |
| Prescott | Columbia |
| Prescott Post Office (historical) | Columbia |
| Preston Post Office (historical) | Lane |
| Preuss Post Office (historical) | Coos |
| Price Post Office (historical) | Crook |
| Prichard Post Office (historical) | Baker |
| Princeton (historical) | Harney |
| Princeton Post Office | Harney |
| Prineville | Crook |
| Prineville Post Office | Crook |
| Pringle Park Plaza Post Office | Marion |
| Pringlefalls Post Office (historical) | Deschutes |
| Progress | Washington |
| Progress Post Office (historical) | Washington |
| Promise | Wallowa |
| Promise Post Office (historical) | Wallowa |
| Pronghorn Census Designated Place | Deschutes |
| Prospect | Jackson |
| Prospect Census Designated Place | Jackson |
| Prospect Post Office | Jackson |
| Prosper | Coos |
| Prosper Post Office (historical) | Coos |
| Provolt | Jackson |
| Provolt Post Office (historical) | Jackson |
| Purdy Post Office (historical) | Umatilla |
| Pursel Post Office (historical) | Jackson |
| Putnam (historical) | Polk |
| Pyrite Post Office (historical) | Marion |