| # | County | City or Town | Type | Population | City | % Correct |
|---|---|---|---|---|---|---|
| 175 | Okanogan | City | Code (county seat) | 2,401 | Okanogan | 100%
|
| 171 | Island | City | Code | 25,008 | Oak Harbor | 50%
|
| 172 | Grays Harbor | City | Code | 738 | Oakville | 50%
|
| 173 | Grays Harbor | City | Code | 7,793 | Ocean Shores | 50%
|
| 174 | Lincoln | Town | 954 | Odessa | 50%
| |
| 176 | Thurston | City | Code (county seat) | 56,510 | Olympia | 50%
|
| 177 | Okanogan | City | Code | 5,152 | Omak | 50%
|
| 178 | Okanogan | City | Code | 1,808 | Oroville | 50%
|
| 179 | Pierce | City | Code | 8,790 | Orting | 50%
|
| 180 | Adams | City | Code | 9,015 | Othello | 50%
|
| 170 | Whitman | Town | 396 | Oakesdale | 0%
|