Foster, county (646 sq mi/1,673 sq km; 1990 pop. 3,983), central N.Dak.; Carrington; 47°27'N 98°52'W. Drift prairie drained by James R. and Pipestem Creek. Sunflowers, wheat, barley, flax; cattle; dairy prods. Juanita L. in NE, small lakes in S. Formed 1873, organized 1883.
Capital city or county seat is shown by the symbol