Nuestra Señora e La Paz is the administrative capital of Bolivia, as well as the departmental capital of La Paz Department. As of the 2001 census, the city of La Paz had a population of around one million, and together with the neighboring cities of El Alto and Viacha, make the biggest urban area of Bolivia, with a population of over 1.6 million inhabitants (Instituto Nacional de Estadisticas - Bolivia).