Just to follow up with you as checking with your state is the best option. In each state there are requirements depending on the type of business you are doing as well. WA does not have a state income tax, but there are excise taxes and other registration that needs to be completed to run a business in WA. The Secretary of State is the best source of information. Washington Limited Liability Company
Either way when you register if you are not a resident you will be registering as a foreign corp in that state.
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