Yamhill County /

Yamhill County is a county located in the U.S. state of Oregon. According to Oregon Geographic Names, the origin of the name is uncertain, but is probably from an explorer's name for a local Native American tribe, the Yamhill, who are part of the North Kalapuyan family. The population of Yamhill County was 99,193 in the 2010 census. The county seat is located at McMinnville. Yamhill County ranks seventh out of Oregon's thirty-six counties in annual market value of its agricultural production. This agricultural production includes wheat, barley, horticulture, and dairy farming, with 13,201 acres (53 km²) in 1997 planted in orchards. One-third of the county is covered with commercial timber, and the economic mainstay of the western part of the county is logging and timber products. Yamhill County is also the center of Oregon's wine industry, having the largest area of any Oregon county planted in vineyards. Six of the state's American Viticultural Areas are wholly or partly in the county: Chehalem Mountains AVA, Dundee Hills AVA, Eola-Amity Hills AVA, McMinnville AVA, Ribbon Ridge AVA, and Yamhill-Carlton District AVA. Over 80 wineries and 200 vineyards represent the largest