Alphabetical listing of Places in Oregon
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| O'Brien | city | Oregon | United States | 42.07 | -123.70 | 1669 | |
| O'Neil Corners | city | Oregon | United States | 45.27 | -122.66 | 180 | |
| Oak Creek (historical) | city | Oregon | United States | 43.27 | -123.21 | 830 | |
| Oak Grove | city | Oregon | United States | 45.42 | -122.64 | 200 | |
| Oak Grove | city | Oregon | United States | 45.66 | -121.59 | 994 | |
| Oak Hills | city | Oregon | United States | 45.54 | -122.84 | 216 | |
| Oak Park | city | Oregon | United States | 44.96 | -122.98 | 180 | |
| Oakdale | city | Oregon | United States | 44.91 | -123.38 | 830 | |
| Oakland | city | Oregon | United States | 43.42 | -123.30 | 830 | |
| Oaklawn | city | Oregon | United States | 45.12 | -122.73 | 200 | |
| Oakridge | city | Oregon | United States | 43.75 | -122.46 | 1220 | |
| Oaks | city | Oregon | United States | 43.19 | -123.36 | 925 | |
| Oatfield | city | Oregon | United States | 45.41 | -122.61 | 203 | |
| Ocean Park | city | Oregon | United States | 44.73 | -124.06 | 118 | |
| Oceanlake | city | Oregon | United States | 44.98 | -124.01 | 49 | |
| Oceanside | city | Oregon | United States | 45.46 | -123.97 | 134 | |
| Odell | city | Oregon | United States | 45.63 | -121.54 | 830 | |
| Odell Lake | city | Oregon | United States | 43.55 | -121.96 | 5029 | |
| Oklahoma Hill | city | Oregon | United States | 46.14 | -123.41 | 196 | |
| Olalla | city | Oregon | United States | 43.07 | -123.55 | 830 | |
| Old Colton | city | Oregon | United States | 45.17 | -122.41 | 843 | |
| Old Town | city | Oregon | United States | 43.43 | -123.30 | 830 | |
| Olene | city | Oregon | United States | 42.17 | -121.63 | 4199 | |
| Olex | city | Oregon | United States | 45.50 | -120.17 | 1184 | |
| Olney | city | Oregon | United States | 46.10 | -123.76 | 200 | |
| Ona | city | Oregon | United States | 44.50 | -124.02 | 196 | |
| Ontario | city | Oregon | United States | 44.03 | -116.96 | 2509 | |
| Ontario Heights | city | Oregon | United States | 44.07 | -117.02 | 2509 | |
| Opal City | city | Oregon | United States | 44.44 | -121.21 | 2811 | |
| Ophir | city | Oregon | United States | 42.56 | -124.38 | 196 | |
| Ordnance (historical) | city | Oregon | United States | 45.80 | -119.42 | 830 | |
| Oregon City | city | Oregon | United States | 45.36 | -122.61 | 196 | |
| Orenco | city | Oregon | United States | 45.53 | -122.91 | 200 | |
| Oretown | city | Oregon | United States | 45.15 | -123.96 | 200 | |
| Orient | city | Oregon | United States | 45.47 | -122.35 | 830 | |
| Ortley | city | Oregon | United States | 45.66 | -121.29 | 1837 | |
| Otis | city | Oregon | United States | 45.02 | -123.95 | 200 | |
| Otter Rock | city | Oregon | United States | 44.75 | -124.06 | 160 | |
| Owyhee | city | Oregon | United States | 43.79 | -117.06 | 2509 | |
| Oxbow | city | Oregon | United States | 44.97 | -116.86 | 2043 | |
| Oxbow (historical) | city | Oregon | United States | 44.97 | -116.85 | 1889 | |
| Oysterville | city | Oregon | United States | 44.58 | -124.00 | 190 | |
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