Greer County, Oklahoma

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Greer County is a county located in the U.S. state of Oklahoma. As of 2000, the population was 6,061. Its county seat is Mangum[1]. From 1860 to 1896, the state of Texas claimed an area known as Greer County, Texas, which included present-day Greer County along with neighboring areas.



According to the U.S. Census Bureau, the county has a total area of 644 square miles (1,668.0 km2), of which 639 square miles (1,655.0 km2) is land and 4 square miles (10.4 km2) (0.67%) is water.

Major highways

Adjacent counties


After a dispute over the Adams-Onís Treaty of 1819, both the governments of the United States and the state of Texas claimed ownership of some 1.5 million acres (6,000 km²) in what was then operated as Greer County, Texas. Litigation followed, and in the case of United States v. State of Texas 162 U.S. 1 (1896), issued on March 16, the Supreme Court, having original jurisdiction over the case, decided in favor of the United States. The county was then assigned to the Oklahoma Territory on May 4, 1896, and when Oklahoma became a state, in addition to becoming Greer County, the region was also further split into Harmon, Jackson, and part of Beckham counties.

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