1120 SW 5th Ave, Room 901, Portland, OR 97204
The State of Oregon's "Filing in Oregon" website provides resources and a guide to help people starting a business in Oregon. Following the steps below will assist you when you decide to register with the City of Portland and Multnomah County.
State of Oregon business search, forms, filing, and information
Oregon Secretary of State, Corporation Division
Information about whether you need a federal employer ID, and how to apply