Comonfort, city (1990 pop. 18,327) and township, Guanajuato, central Mexico, on Laja R., and 37 mi/60 km SE of Guanajuato on Mexico Highway 51; 20°48'N 100°46'W. On RR. Agr. center (wheat, corn, alfalfa, beans, sugarcane, fruit; livestock). Formerly Chamacuero de Comonfort.