GUADALAJARA, a province of Spain, in New Castile, bounded on the N. by the provinces of Segovia, Soria, and Saragossa, S. by Cuenca, E. by Saragossa and Teruel, and W. by Madrid. In Atienza in the north of this province are some of the loftiest summits in the Peninsula, having their culminating point in the Peña de la Bodera. The soil varies considerably, but is generally of good quality. Pasture occupies the larger portion of the surface in the higher tracts. The districts of Tamajon are admirably adapted for cereals. Alcarria, however, matures all kinds of crops common to the latitude. Iron and lead are the only minerals; the former is very abundant, and has been worked from the remotest periods; the latter occurs but in small quantities. The principal productions are wheat, barley, oil, wine, silk, saffron, and flax; but the chief wealth of the province consists in sheep and wool. Manufactures and trade have been gradually declining for many years. For administration the province is divided into nine districts, of which Guadalajara is the capital. The estimated population of this province is (1856) upwards of 200,000; and the area is 1951 English square miles.