Harmon County, Administrative county in southwestern Oklahoma, United States.
Harmon County is an administrative division in southwestern Oklahoma characterized by red soil plains and gypsum formations scattered across the landscape. The terrain consists of gentle, open grassland typical of the southern Great Plains region.
The county was created in 1909 and named after Judson Harmon, who served as Governor of Ohio. A Supreme Court decision in 1930 redrew the Texas border, resulting in a significant reduction of its original size.
Agriculture shapes daily life here, with cotton, wheat, and sorghum fields visible across the landscape and woven into community identity. These farming traditions remain central to how local residents understand and organize their world.
County administrative services are located in the 1926 courthouse building in Hollis, which serves as the county seat. The area is best explored by car, as communities and services are spread across open land.
The county was originally much larger until a 1930 Supreme Court decision shifted its Texas border eastward. This boundary change is a rare example of how U.S. state borders have been redrawn by court order.
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