About Oregon State University. Oregon State University in Corvallis, OR reports an overall acceptance rate of 77.0%, an early-round acceptance rate of 77.0%, an SAT middle 50% of 1160–1390, a class size of 5,095, and a yield of 20.0% based on the most recent Common Data Set filings. Leading research university for forestry, oceanography, and environmental sciences. Only school in Oregon to hold land-grant, sea-grant, space-grant, and sun-grant designations.