I picked up the paper Multnomah County Library brochure on Finding Local Newspaper Articles and thought the information might be useful to my readers here at the OLR blog.
1) You can see their online list of newspaper and other media web resources.
2) A similar list is at the University of Oregon website, Finding Articles in Oregon Newspapers
3) Your own public library will have its own lists and guides of local and online resources.
4) Or, send your search request to the Oregon Libraries Network, aka L-net where a network of Oregon librarians await your reference questions.