Of 36 counties in the state, Columbia County is 33rd in terms of its size (688 square miles). Columbia County is in Northwest Oregon. The total value of around 1,000 acres of riverfront property recently listed for sale in Oregon's Columbia County was about $3 million. Browse all waterfront property for sale in Columbia County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Columbia County is residential property.