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I am sorry to hear about this situation. If Plaintiff lives in CountyA and Defendant lives in CountyB, and then the event occurred in CountyC, then, it is possible to have a situation where more than one county is the proper venue for you to file your lawsuit. It can be A, B, or C.
So if you are in Bellingham, but the Defendant is in Seattle, then technically speaking both jurisdictions overlap. By rule of thumb, it is always better to file in the DEFENDANT's jurisdiction, unless the EVENT took place in another (third) county, in which case it is best to file in that third jurisdiction.
Ergo, assuming that no third jurisdiction is applicable, and the Defendant is in Seattle, it may be best to file in Seattle.
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