Hermosillo is the capital of the Mexican state of Sonora. It is centrally locate within the state at 29°5′N, 110°57′W and is within several hundred miles of several other major Mexican cities, such as Tijuana and Mexicali, and U.S. cities such as Phoenix and Tucson, Arizona. The city's official 2005 census population was 641,791. It is the municipal seat of the surrounding Hermosillo municipality, with a population of 701,838, and a much larger area, the largest in the state and ninth-largest in Mexico at 14,880.2 km² (5,745.3 sq mi) and including the largest island in México Tiburón Island.