Cascadia is an unincorporated community that was established in 1892 on the South Santiam River, 14 miles east of the current city of Sweet Home, in Linn County, Oregon, United States. Originally a stage stop on the Santiam Wagon Road, then a summer resort also known as Cascadia Mineral Springs, Cascadia had a post office established in 1898. It still maintains a zip code of 97329. The resort had a hotel established by George Geisendorfer, who was also the first postmaster. People were attracted to Cascadia because of its mineral spring water. The property was sold to the state in 1940 and now is the site of the 300-acre Cascadia State Park.