| Baker | Benton | Clackamas | Clatsop | Columbia | Coos | Crook | Curry | Deschutes |
| Douglas | Gilliam | Grant | Harney | Hood River | Jackson | Jefferson | Josephine | Klamath |
| Lake | Lane | Lincoln | Linn | Malheur | Marion | Morrow | Multnomah | Polk |
| Sherman | Tillamook | Umatilla | Union | Wallowa | Wasco | Washington | Wheeler | Yamhill |
| County | County Seat | Postcards |
| Baker | Baker City |
| Benton | Corvallis |
)
|
| Clackamas | Oregon City |
) |
| Clatsop | Astoria |
| Columbia | St. Helens |
| Coos | Coquille |
) |
| Crook | Prineville |
| Curry | Gold Beach |
) |
| Deschutes | Bend |
)
|
| Douglas | Roseburg |
| Gilliam | Condon |
| Grant | Canyon City |
| Harney | Burns |
| Hood River | Hood River |
| Jackson | Medford |
| Jefferson | Madras |
| Josephine | Grants Pass |
) |
| Klamath | Klamath Falls |
| Lake | Lakeview |
| Lane | Eugene |
) |
| Lincoln | Toledo (1893-1954) |
| Newport (1954 - ) |
| Linn | Albany |
| Malheur | Vale |
| Marion | Salem |
)
|
| Morrow | Heppner |
| Multnomah | Portland |
| Polk | Dallas |
)
|
| Sherman | Moro |
| Tillamook | Tillamook |
)
|
| Umatilla | Pendleton |
| Union | La Grande |
| Wallowa | Enterprise |
| Wasco | The Dalles |
| Washington | Hillsboro |
| Wheeler | Fossil |
| Yamhill | McMinnville |
