text: Oregon 's population is largely concentrated in the Willamette Valley , which stretches from Eugene in the south ( home of the University of Oregon ) through Corvallis ( home of Oregon State University ) and Salem ( the capital ) to Portland ( Oregon 's largest city ) .
simplified: There are a number of colleges and universities in Oregon . The four-year universities with the most students are Portland State University , Oregon State University , and the University of Oregon .