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Grant County is a county located in the U.S. state of Oregon . It is included in the 8 county definition of Eastern Oregon . In 2010, its population was 7,445. It is named for President Ulysses S. Grant , who served as an army officer in the Oregon Territory , and at the time of the county's creation was a Union general in the American Civil War . The seat of the county is Canyon City .
This section does not cite any references or sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . Grant County was established on October 14, 1864, from parts of old Wasco and old Umatilla counties. Prior to its creation, cases brought to court were tried in The Dalles , county seat of the vast Wasco County. The great distance to The Dalles made law enforcement a difficult problem, and imposed a heavy burden on citizens who had a need to transact business at the courthouse. In 1889, more than half of the southern part of the original Grant County was taken to form Harney County . Also in 1899, a small part of northwestern Grant County was taken to form Wheeler County . After gold was discovered in 1862 on Whiskey Flat, it has been estimated that within ten days 1,000 miners were camped along Canyon Creek. This increased population created a need for county government.
