Lamesa (ləmēˈsə) [key], city (1990 pop. 10,809), seat of Dawson co., NW Tex., in the Llano Estacado; inc. 1917. Lamesa is a processing and shipping center for an irrigated area where cattle and hogs are raised and cotton, sorghum, and wheat are grown. Manufactures include electric motors, sheet metal, cottonseed oil and other cotton products, and apparel. The city also has several oil and natural-gas wells.