Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Porcupine Canyon | Valley | | Morrow | 45 14 08 N | 119 43 50 W |
| Porcupine Creek | Stream | | Douglas | 43 09 42 N | 122 08 13 W |
| Porcupine Creek | Stream | | Jackson | 42 03 40 N | 122 32 40 W |
| Porcupine Creek | Stream | | Lake | 42 17 03 N | 120 12 32 W |
| Porcupine Flat | Flat | 1598 | Lake | 43 35 09 N | 120 49 19 W |
| Porcupine Guard Station | Locale | 1708 | Union | 45 06 30 N | 118 09 54 W |
| Porcupine Lake | Flat | 1515 | Deschutes | 43 38 01 N | 120 36 39 W |
| Porcupine Mountain | Summit | 1605 | Jackson | 42 02 47 N | 122 32 37 W |
| Porcupine Peak | Summit | 1865 | Linn | 44 29 43 N | 121 51 06 W |
| Porcupine Reservoir | Reservoir | 1280 | Crook | 44 16 05 N | 119 49 55 W |
| Porcupine Reservoir | Reservoir | 1539 | Jackson | 42 01 58 N | 122 34 14 W |
| Porcupine Reservoir | Reservoir | 1470 | Malheur | 42 34 52 N | 117 13 37 W |
| Porcupine Reservoir | Reservoir | 1429 | Malheur | 43 07 20 N | 118 09 27 W |
| Porcupine Ridge | Ridge | 893 | Gilliam | 45 11 40 N | 120 21 52 W |
| Porcupine Ridge | Ridge | 1564 | Morrow | 45 08 20 N | 119 21 08 W |
| Porcupine Spring | Spring | 1130 | Baker | 44 29 37 N | 117 16 60 W |
| Porcupine Spring | Spring | 1642 | Grant | 44 34 25 N | 118 54 11 W |
| Porcupine Spring | Spring | 1644 | Harney | 43 53 50 N | 119 30 57 W |
| Porcupine Spring | Spring | 1225 | Jackson | 42 26 30 N | 122 23 53 W |
| Porfily Ranch | Locale | 1002 | Crook | 44 10 40 N | 120 36 46 W |
| Porkchop Lake | Flat | 1390 | Crook | 43 57 13 N | 119 56 47 W |
| Porky Creek | Stream | | Grant | 44 40 24 N | 118 37 17 W |
| Porky Lake | Lake | 1476 | Lane | 43 55 58 N | 121 54 21 W |
| Porphyry Spring | Spring | 924 | Coos | 42 47 39 N | 123 51 34 W |
| Port Arbour Seaplane Base (historical) | Airport | 17 | Multnomah | 45 27 35 N | 122 39 34 W |
| Port Barnum (historical) | Locale | 1 | Coos | 43 19 39 N | 124 12 04 W |
| Port Clatsop Post Office (historical) | Post Office | 2 | Clatsop | 46 08 00 N | 123 52 37 W |
| Port Dock (historical) | Locale | 2 | Clatsop | 46 11 16 N | 123 51 17 W |
| Port Marina Park | Park | 27 | Hood River | 45 42 39 N | 121 30 24 W |
| Port of Bay City Boat Moorage | Locale | 1 | Tillamook | 45 33 22 N | 123 54 46 W |
| Port of Brookings | Harbor | 2 | Curry | 42 02 51 N | 124 16 07 W |
| Port of Morrow | Harbor | 83 | Morrow | 45 51 09 N | 119 40 19 W |
| Port of Portland | Locale | 3 | Multnomah | 45 34 03 N | 122 43 20 W |
| Port of Portland Berth 203 | Locale | 6 | Multnomah | 45 33 55 N | 122 42 56 W |
| Port of Portland Berth 204 | Locale | 3 | Multnomah | 45 33 51 N | 122 42 47 W |
| Port of Portland Berth 205 | Locale | 7 | Multnomah | 45 32 53 N | 122 41 58 W |
| Port of Portland Berth 206 | Locale | 4 | Multnomah | 45 32 49 N | 122 41 50 W |
| Port of Portland Berth 301 | Locale | 3 | Multnomah | 45 34 06 N | 122 44 20 W |
| Port of Portland Berth 302 | Locale | 7 | Multnomah | 45 32 57 N | 122 42 09 W |
| Port of Portland Berth 303 | Locale | 8 | Multnomah | 45 32 53 N | 122 42 08 W |
| Port of Portland Berth 304 | Locale | 8 | Multnomah | 45 32 51 N | 122 42 02 W |
| Port of Portland Berth 305 | Locale | 6 | Multnomah | 45 33 44 N | 122 42 36 W |
| Port of Portland Berth 306 | Locale | 6 | Multnomah | 45 33 37 N | 122 42 25 W |
| Port of Portland Berth 307 | Locale | 5 | Multnomah | 45 33 33 N | 122 42 18 W |
| Port of Portland Berth 308 | Locale | 4 | Multnomah | 45 33 29 N | 122 42 11 W |
| Port of the Dalles | Locale | 24 | Wasco | 45 36 14 N | 121 10 46 W |
| Port Orford | Harbor | -3 | Curry | 42 44 19 N | 124 29 28 W |
| Port Orford | Populated Place | 19 | Curry | 42 44 44 N | 124 29 50 W |
| Port Orford Cedar Experimental Forest | Forest | 112 | Coos | 42 37 44 N | 124 03 29 W |
| Port Orford Cedar Forest State Park | Park | 50 | Curry | 42 50 39 N | 124 28 39 W |
| Port Orford Heads State Park | Park | 23 | Curry | 42 44 24 N | 124 30 49 W |
| Port Orford Post Office | Post Office | 19 | Curry | 42 44 44 N | 124 29 50 W |
| Port Spring | Spring | 1643 | Crook | 44 24 22 N | 120 03 59 W |
| Port Westward | Locale | 4 | Columbia | 46 10 38 N | 123 10 47 W |
| Port Westward Spur | Locale | 7 | Columbia | 46 09 41 N | 123 08 37 W |
| Portage Trail | Trail | 860 | Clackamas | 45 23 35 N | 121 48 17 W |
| Porter (historical) | Locale | 394 | Clackamas | 45 15 54 N | 122 13 44 W |
| Porter (historical) | Locale | 1090 | Umatilla | 45 31 59 N | 118 21 44 W |
| Porter Boone Park | Park | 106 | Marion | 44 50 27 N | 122 52 48 W |
| Porter Butte | Summit | 1691 | Klamath | 42 16 14 N | 121 56 18 W |
| Porter Canyon | Valley | | Sherman | 45 08 12 N | 120 34 18 W |
| Porter City Park | Park | 71 | Benton | 44 34 52 N | 123 16 19 W |
| Porter Creek | Populated Place | 200 | Douglas | 43 06 39 N | 123 31 19 W |
| Porter Creek | Stream | | Crook | 44 19 45 N | 120 04 43 W |
| Porter Creek | Stream | | Douglas | 43 03 31 N | 123 25 47 W |
| Porter Creek | Stream | | Douglas | 43 06 15 N | 123 32 37 W |
| Porter Creek | Stream | | Douglas | 42 58 39 N | 123 09 29 W |
| Porter Creek | Stream | | Douglas | 43 26 39 N | 123 33 04 W |
| Porter Creek | Stream | | Grant | 44 59 35 N | 119 37 44 W |
| Porter Creek | Stream | | Lane | 44 06 46 N | 123 56 02 W |
| Porter Creek | Stream | | Marion | 44 50 35 N | 122 53 31 W |
| Porter Field | Flat | 1238 | Malheur | 43 16 14 N | 117 55 46 W |
| Porter Gulch | Valley | | Malheur | 44 24 18 N | 117 46 51 W |
| Porter Hill | Summit | 526 | Douglas | 43 05 15 N | 123 33 24 W |
| Porter Hill | Summit | 1076 | Umatilla | 45 25 32 N | 118 44 34 W |
| Porter Lake | Lake | 72 | Benton | 44 26 52 N | 123 14 40 W |
| Porter Point | Cape | 6 | Tillamook | 45 09 21 N | 123 58 18 W |
| Porter Ranch | Locale | 1510 | Klamath | 43 05 35 N | 121 23 12 W |
| Porter Ranch | Locale | 1318 | Lake | 43 09 26 N | 121 01 12 W |
| Porter Ridge | Ridge | 504 | Clatsop | 46 05 10 N | 123 23 27 W |
| Porter School | School | 386 | Clackamas | 45 15 59 N | 122 13 46 W |
| Porter Slough | Stream | | Marion | 44 45 19 N | 123 06 24 W |
| Porter Spring | Spring | 1285 | Malheur | 43 16 24 N | 117 56 36 W |
| Porter Spring | Spring | 1327 | Union | 45 18 44 N | 118 23 18 W |
| Porter Spring | Spring | 1845 | Wheeler | 44 26 37 N | 120 03 24 W |
| Porters Flat | Flat | 641 | Malheur | 44 16 15 N | 117 06 33 W |
| Porters Island | Island | 636 | Malheur | 44 16 39 N | 117 06 25 W |
| Porterville (historical) | Populated Place | 1428 | Grant | 44 47 45 N | 118 23 43 W |
| Porterville Post Office (historical) | Post Office | 1471 | Lake | 43 04 34 N | 121 13 39 W |
| Portland | Populated Place | 12 | Multnomah | 45 31 24 N | 122 40 34 W |
| Portland Adventist Academy | School | 80 | Multnomah | 45 30 45 N | 122 33 48 W |
| Portland Adventist Elementary School | School | 96 | Multnomah | 45 29 49 N | 122 28 19 W |
| Portland Air Base Post Office (historical) | Post Office | 6 | Multnomah | 45 34 39 N | 122 36 25 W |
| Portland Art Museum | Building | 38 | Multnomah | 45 30 56 N | 122 41 01 W |
| Portland Auto Port Airstrip | Airport | 17 | Multnomah | 45 30 49 N | 122 40 34 W |
| Portland Aventist Medical Center Heliport | Airport | 77 | Multnomah | 45 30 50 N | 122 33 28 W |
| Portland Center City Park | Park | 46 | Multnomah | 45 30 23 N | 122 40 51 W |
| Portland Christian High School | School | 95 | Multnomah | 45 30 43 N | 122 32 48 W |
| Portland Christian School | School | 95 | Multnomah | 45 30 42 N | 122 32 26 W |
| Portland Community College | School | 208 | Multnomah | 45 26 19 N | 122 43 49 W |
| Portland Community College | School | 78 | Washington | 45 34 04 N | 122 51 39 W |
| Portland Creek | Stream | | Lane | 43 58 23 N | 122 31 30 W |
| Portland General Electric (historical) | Locale | 65 | Washington | 45 30 27 N | 122 50 49 W |
| Portland Golf Club | Locale | 73 | Washington | 45 28 38 N | 122 45 44 W |
| Portland Gun Club | Locale | 87 | Multnomah | 45 29 14 N | 122 29 14 W |
| Portland Heights | Populated Place | 220 | Multnomah | 45 30 20 N | 122 42 11 W |
| Portland Heights City Park | Park | 210 | Multnomah | 45 30 16 N | 122 42 32 W |
| Portland Hunt Club | Locale | 72 | Washington | 45 28 17 N | 122 45 15 W |
| Portland International Airport | Airport | 7 | Multnomah | 45 35 19 N | 122 35 36 W |
| Portland International Raceway | Park | 4 | Multnomah | 45 35 48 N | 122 41 52 W |