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I should probably know this...

I have lived in Washington State for 10 years and just moved to California in August. For application purposes: Am I still considered a Washington resident?

You're basically not considered a resident anymore unless you left Washington to go to school and didn't change your driver's license.

All the residency info is here:
http://www.washington.edu/students/reg/residency/

Since you lived there for 10 years you MIGHT be able to re-establish residency after your first year (since you would more easily be able to prove you were there for non-educational reasons).