The capital is Iquique.

Iquique
Iquique is a city in northern Chile, capital of Tarapacá Region, on the Pacific coast, just west of the Atacama Desert. It is located at 20°13′S 70°10′W and has a population of 221,400 (2004). The city's name comes from the Aymara word "Ique-ique", which translates to "lazyness", but can also mean "sleep" or "bed."
Iquique has one of the largest commercial port centers (or Zona Franca) of South America and has been traditionally called Zofri. There are around 2.4 km² of warehouses, banking branches, and restaurants.

History
Although the city was founded in the sixteenth century, there is evidence of habitation in the area by the Chango people as early as 7000 BC. During colonial times, Iquique was geographically assigned to the Viceroyalty of Peru and remained part of Peruvian territory until the end of the XIX century. Iquique's early development was due in large part to the discovery of mineral riches, particularly the presence of large deposits of potassium nitrate (saltpetre) in the Atacama Desert (then part of Bolivian territory). Later territorial disputes triggered the War of the Pacific in 1879, allowing Iquique to formally become part Chilean territory thereafter. In subsequent years the further exportation of saltpetre (mainly to European countries) significantly helped in the development of the city, attracting foreigners and rapidly expanding housing projects. Municipal Theather of IquiqueIn 1907, the city was marred by a massacre when the police opened fire on a group of about 8,500 saltpetre miners assembled inside the Santa María School who had marched into town to protest their lot. Hundreds were killed. The folk group Quilapayún recorded an album in remembrance of the event (Cantata Popular Santa María de Iquique) in 1970.

Trivia
In 1835, Charles Darwin, during his voyage on the Beagle, travelled to Iquique and described a town very much in want of everyday necessities, such as water and firewood. These had to be brought in from a considerable distance. Darwin also visited the saltpetre works. In 1868 and again in 1877, the city was devastated by earthquakes. The 16 June 2005 there was yet another earthquake, with a 7.9 on the scale of Richter.