Name | Population | Altitude | Latitude | Longitude |
Oak Grove (Oak Grove) : | 12 674 | 61 m | 45°25'0.8" N | 122°38'20.4" W |
Oak Hills (Oak Hills) : | 10 410 | 66 m | 45°32'29.0" N | 122°50'24.0" W |
Oak Park : |
| 53 m | 44°57'51.8" N | 122°58'55.2" W |
Oakdale : |
| 245 m | 44°54'20.2" N | 123°22'44.4" W |
Oakland (Oakland) : | 963 | 167 m | 43°25'19.9" N | 123°17'49.2" W |
Oaklawn : |
| 61 m | 45°7'9.8" N | 122°43'40.8" W |
Oakridge (Oakridge) : | 3 156 | 366 m | 43°44'48.1" N | 122°27'39.6" W |
Oaks : |
| 163 m | 43°11'15.0" N | 123°21'39.6" W |
Ocean Park : |
| 18 m | 44°43'32.2" N | 124°3'14.4" W |
Oceanside (Oceanside) : | 347 |
| 45°27'40.0" N | 123°58'1.2" W |
Odell (Odell) : | 1 969 | 243 m | 45°37'37.9" N | 121°32'31.2" W |
Odell Lake : |
| 1 460 m | 43°32'57.1" N | 121°57'50.4" W |
Oklahoma Hill : |
| 38 m | 46°8'35.9" N | 123°24'18.0" W |
Olalla : |
| 293 m | 43°4'1.9" N | 123°33'10.8" W |
Old Colton : |
| 257 m | 45°10'19.9" N | 122°24'50.4" W |
Old Town : |
| 157 m | 43°25'59.2" N | 123°17'38.4" W |
Olene : |
| 1 280 m | 42°10'18.8" N | 121°37'48.0" W |
Olex : |
| 304 m | 45°29'49.9" N | 120°10'4.8" W |
Olney : |
| 119 m | 46°6'1.1" N | 123°45'21.6" W |
Ona : |
| 40 m | 44°30'15.1" N | 124°1'15.6" W |
Ontario (Ontario) : | 10 969 | 643 m | 44°1'36.1" N | 116°57'43.2" W |
Ontario Heights : |
| 697 m | 44°4'14.2" N | 117°1'19.2" W |
Opal City : |
| 874 m | 44°26'40.9" N | 121°12'46.8" W |
Ophir : |
| 60 m | 42°33'47.9" N | 124°22'55.2" W |
Oregon City (Oregon City) : | 29 984 | 60 m | 45°21'27.0" N | 122°36'21.6" W |
Orenco : |
| 61 m | 45°31'40.1" N | 122°54'39.6" W |
Oretown : |
| 61 m | 45°9'14.0" N | 123°57'14.4" W |
Orient : |
| 155 m | 45°28'3.0" N | 122°21'3.6" W |
Ortley : |
| 560 m | 45°39'22.0" N | 121°17'13.2" W |
Otis : |
| 61 m | 45°1'27.8" N | 123°56'42.0" W |
Otter Rock : |
|
| 44°44'49.9" N | 124°3'36.0" W |
Owyhee : |
| 682 m | 43°47'42.0" N | 117°3'14.4" W |
Oxbow : |
| 623 m | 44°58'30.0" N | 116°51'43.2" W |
Oysterville : |
| 1 m | 44°34'41.2" N | 124°0'3.6" W |
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