Lebanon is a city in Linn County, Oregon, United States. Lebanon is located in northwest Oregon, southeast of Salem. The population was 19,690 at the 2020 census. Lebanon sits beside the South Santiam River on the eastern edge of the Willamette Valley, close to the Cascade Range and a 25-minute drive to either of the larger cities of Corvallis and Albany. Lebanon is known for its foot-and-bike trails and its small-town character.