The vilayet of Janina was ethnically, linguistically and culturally diverse. There have been a number of estimates about the ethnicity and the religious affiliation of the local population. The Ottoman Empire classified and counted its citizens according to religion and not ethnicity, which led to inefficient censuses and lack of classification of populations according to their ethnic groups. The vilayet was predominantly inhabited by
Albanians and
Greeks, while the major religions were Islam and Christian Orthodoxy. The districts of Janina which were later incorporated into Greece were heavily Greek. According to the 1890/91 Ottoman Yearly report, the vilayet of Janina had 512,812 inhabitants, of which 44% were Muslims, 48% were
orthodox Christians 7% were
Aromanians, and 0.7% were Jewish. Orthodox Albanians constituted for 52% of the Orthodox population, whilst Greeks constituted 48% of the Orthodox population. Albanians accounted for 69% of the population whilst Greeks accounted for 23% of it. According to Aram Andonyan and Zavren Biberyan in 1908 of a total population of 648,000, 315,000 inhabitants were
Albanians, most of which were Muslims and Orthodox, and some who were adherents of
Roman Catholicism. Aromanians and
Greeks were about 180,000 and 110,000 respectively. Nikolaidou adds that the sanjaks of Janina, Preveza and Gjirokastër were predominantly Greek, the sanjak of Igoumenitsa (then Gümeniçe, Reşadiye between 1909 and 1913 due to honour of
Mehmet V, Ottoman Sultan) had a slight majority of Greeks, and that of Berat north was predominantly Albanian. Winnifrith considers the Ottoman statistics of 1908 as unreliable. He states that a decline of the population is noticeable in these figures as a result of emigration to Greece and America, while the Aromanian figure appears small. According to Sir
Hamilton Alexander Rosskeen Gibb in 1895 there were c. 224,000 Muslims. The Orthodox population included c. 118,000 Greeks (partly of Albanian origin, Hellenized over a century by Greek religious and educational institutions) and c. 129,500 Albanians, and the Jewish population amounted to 3,500 people. According to Zafer Golen two-thirds of the population were Albanian Muslims, while according to Dimitrios Chasiotis c. 419,403 of the total population were Greeks, along with 239,000 Turks and Albanians, and 6,000 Jews. Lontos estimated that 3/4 of the population was Christian. ==Administrative divisions==