Page "Union County, Oregon" Paragraph 13
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According to Oregon Geographic Names, the county is named for the town of Union.
Union County was originally part of Wasco County.
The northern end of the Grande Ronde Valley was the first part to be settled.
During the 1860s, population growth in eastern Oregon prompted the State Legislature to split Umatilla and Baker Counties from Wasco County in 1862.
Further settlement in the Grande Ronde Valley led to the division of Baker County to create Union County on October 14, 1864.
The county doubled in population between 1880 and 1890.
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