Plainview. 1 Uninc. city (1990 pop. 26,207), Nassau co., SE N.Y., on Long Island. It is chiefly residential. 2 City (1990 pop. 21,700), seat of Hale co., NW Tex., on the Llano Estacado; inc. 1907. The level plain, irrigated by shallow wells from a large underground water belt, yields wheat, grain sorghum, soybeans, and cotton, and cattle are raised. Plainview's industries include food processing and the production of hybrid seeds and farm equipment. Wayland Baptist Univ. and the Llano Estacado Museum are in the city.