With the Treaty of London, on 3 February 1830, however, which determined the borders of the newly established Greek state, the freed islands of the Eastern Sporades were given over to the Ottoman Empire again. According to the Ottoman General Census of 1881/82-1893, the kaza of Leros had a total population of 6.754, consisting of 6.623 Greeks, 18 Muslims and 113 foreign citizens. In the "Diary of the Prefecture of the Archipelago" of 1886, Leros, along with the islands of Patmos, Lipsos and Fournoi, belonged to the Ottomans. The island's administrative council was made up of both Greeks and Turks.