| 2018-01-05 | When repeated, a Northwest city |
| 2016-01-24 | When doubled, a Washington city, county or river |
| 2009-08-22 | When repeated, Columbia feeder |
| 2005-02-08 | When repeated, a city in Washington |
| 2004-06-24 | Doubled, home of Whitman College |
| 2001-04-17 | When doubled, a Washington city |
| 1999-03-22 | When repeated, a Washington city |
| 1999-01-03 | When doubled, a Washington city |
| 1998-07-16 | When repeated, a Western city |
| 1998-05-05 | When repeated, a Washington city |
| 1997-05-01 | *Home of Whitman College |
| 1996-02-20 | When repeated, an Evergreen State city |
| 1994-02-22 | Half of a Western city name |