what county is corvallis or in?
Corvallis, OR. Sponsored Topics. Corvallis ( /kÉrvÃ¦lÉ¨s/) is a city located in central western Oregon, United States. It is the county seat of Benton County and the principal city of the Corvallis, Oregon Metropolitan Statistical Area, which encompasses all of Benton County. As of the 2010 United States Census, the population was 54,462.