| The islands of Ibiza and Formentera has | | | | happened from 3,539 to 15,081 in the same dates. |
| quadruplicated their population in the last 160 years, | | | | Santa Eulària, Sant Josep and Formentera has |
| according to the data done by the National Institute | | | | had some oscillation and has gotten to register |
| of Estadi'stica (INE). The growth of the number of | | | | censuses lower than the previous one, but in the last |
| homes has been much more spectacular, but the | | | | years have experienced a remarkable ascent. |
| biggest changes has been from halves of XX | | | | Thus, in 2001 Santa Eulària (second |
| century, with the tourist boom, since there has been | | | | municipality in population) it had a census of 19,808 |
| a tendency to the loss in the number of children of | | | | inhabitants; Sant Josep, of 14,267, and Formentera of |
| the families. The fact that the population has grown | | | | 5.553. In the smaller Pitiusa, perhaps by its territorial |
| more although the families have less children because | | | | limitations, the growth less is accelerated and exists a |
| the increase of the immigration produced the result | | | | tendency to the comparison in number of inhabitants |
| of the tourist phenomenon, in which the islands | | | | between the secondary municipalities of the island of |
| happen to be lacking manual labor towards other | | | | Eivissa (Santa Eulària, Sant Antoni and Sant |
| regions or foreigners, there for has been receiving | | | | Josep). Sant Joan, atypical case the smaller growth, |
| workers of services, Spanish as as much foreign. | | | | where in 1842 the census was of 3,655 inhabitants |
| The tourism also has caused the increase of | | | | and in 2001, of 100 people less, that is to say, 3.555. |
| European population that has established itself in the | | | | But they had doubled the homes, since the 613 of |
| islands as a second residence or his first in the case | | | | 1842 happened to the 1,198 of 1991. The global |
| of older people and this phenomenon also affects the | | | | numbers of Ibiza and Formentera have been |
| population data. The city of Ibiza and municipioo of | | | | increasing throughout all the exposed period. The |
| Sant Antoni have had a uninterupted growth during | | | | number of the homes is significant to this ascending |
| the studied period. First it had 5,118 inhabitants in | | | | curve. The 4,062 addresses of 1842 have become |
| 1842 and 34.826 in 2001, and the second it has | | | | 33.014 in the last. |