Oswald is an unincorporated locality in Sutter County. It is located near the west bank of the Feather River (opposite Pearson), south of Bogue, north of Abbott, east of the Sutter National Wildlife Refuge, and southeast of Sutter.
The U.S. Postal Service sometimes lists addresses in Oswald as being in Yuba City, because Oswald is in the 95991 zip code and Yuba City is partly in it as well. However, on the Yuba-Sutter Wiki, we prefer listing the more specific location Oswald.
Oswald is named for August Oswald, a pioneer who settled there in 1850. It had its own post office from 1914 to 1918.1
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1. California's Geographic Names: A Gazetteer of Historic and Modern Names of the State by David L. Durham. Word Dancer Press, 1998