You file for unemployment in the state where  you are employed; state  of residence does not matter. Therefore, if you are a WA employee, that's where you have to file; you can't file in OR, even if that's where the company is based out of and where you occasionally work.You can appeal you denial if you think there are grounds. Remember, if you left voluntarily, you are not eligible, even if you left for "good" reasons. If you were terminated, then as long as you were not fired for cause (e.g. not for insubordination, violating company policy, absenteeism, assault or  theft at work, etc.), you should normally be able to collect unemployment. (The other issue would be whether you worked enough hours to qualify--see the requirements for UI provided by the state.)