[The series and its rules are explained here, where you will also find links to the songs for the other states.]
47:1. Ballad of Donald White: 'I landed in the old Northwest / Seattle, Washington'. (1.)
47:2. Washington State Fight Song: 'Fight, fight, fight for Washington State!' (1, 2.)
47:3. Washington, My Home. (1, 2.)
47:4. Bow Down To Washington! 'So, heaven help the foes of Washington'. (1.)