Corvallis ( kor-VAL-iss) is a city in and the county seat of Benton County in central western Oregon, United States. It is the principal city of the Corvallis, Oregon Metropolitan Statistical Area, which encompasses all of Benton County. As of the 2023 Census Population Estimates, the population was 61,087, making it the 9th most populous city in Oregon. This does not include the nearly 25,000 Oregon State University students attending classes in Corvallis, over 5,250 of which live in one of 16 Residence Halls on the main campus. Corvallis is the location of Oregon State University and Good Samaritan Regional Medical Center, and a 2.2 million square foot, 197 acre Hewlett Packard research and development campus that invented the Laser jet printer and the Computer mouse. Corvallis is a part of the Silicon Forest Corvallis is the westernmost city in the contiguous 48 states with a population larger than 50,000. Corvallis is the largest principal city of the Albany-Corvallis-Lebanon CSA, a Combined Statistical Area that includes the Corvallis metropolitan area (Benton County) and the Albany-Lebanon micropolitan area (Linn County), which had a combined population of 229,209 at the 2023 U.S. Census Estimates.