There are 14 US Post Offices in Darke County serving a total of 48,874 residents equating to 3,491 residents per post office. It's estimated that approximately 78,008 packages are handled across the 14 county post offices annually. Darke County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 52,959. Its county seat is Greenville. The county was created in 1809 and later organized in 1817. It is named for William Darke, an officer in the Revolution. Darke County comprises the Greenville, OH Micropolitan Statistical Area, which is also included in the Dayton-Springfield-Sidney, OH Combined Statistical Area. Notable people included Annie Oakley, famed 19th-century markswoman who performed with Buffalo Bill's Wild West show, who was born in Darke County; and Lucullus Virgil McWhorter, a farmer and frontiersman who studied and wrote about the historical American Indian tribes of West Virginia and Ohio. After moving to Yakima, Washington in 1903, he documented and became an advocate for the contemporary Yakama and Nez Perce peoples. In addition, he collected their oral histories. Legendary travel author and broadcaster, Lowell Thomas, was born in Darke County."