O
Oak Grove - Oak Hills* - Oakland - Oakridge - Oatfield - O'Brien - Oceanside - Odell - Odessa - Olene - Olex - Olney - Ontario - Ophir - Oregon City - Orenco* - Oretown - Orodell - Ortley - Otis - Otter Rock - Owyhee - Oxbow
Read more about this topic: List Of Cities And Unincorporated Communities In Oregon