In 1896, the United States Supreme Court ruled that Greer County did not belong to Texas as claimed, but was part of Oklahoma Territory. The decision opened up 1,500,000 acres of land for settlement. Texans already living in the area were allowed first choice of a homestead and the opportunity to acquire an additional 160 acres. "Old Greer County" of Texas was later divided up to become Jackson, Greer, Harmon, and a portion of Beckham counties of Oklahoma.
In 1909, two years after Oklahoma became a state, Governor C.W. Haskell proclaimed Harmon a county and named Hollis the county seat.
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The Harmon County Courthouse is listed on the National Register of Historic Places. Harmon County evolved from the tract of land variously claimed as Greer County, Texas, Indian Territory, Oklahoma Territory, and Greer County, Oklahoma. On June 2, 1909Hollis, OK Historic Courthouses