Foster is a small community near Foster Dam, 2 miles east of
Sweet Home along
Highway 20.
The post office for Fost was established February 8, 1892, with Aaron H. Yost first postmaster. C. H. Stewart of Albany told a compiler in 1927 that this location was named for Parley J. Foster, who operated a gristmill in the neighborhood. In 1967, Mrs. William C. Foster added the fact that Parley's father, Alonson Foster, along with his son, also built a sawmill there in 1890.
There is also a Foster, Rhode Island.
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