as a whole, is characterized by a large ethnic diversity. The city is in a region where Macedonians and Albanians meet, and it welcomed Romani, Turks, Jews and Serbs throughout its history. Skopje was mainly a Muslim city until the 19th century, when large numbers of Christians started to settle there. According to the 2021 census, Macedonians were the largest ethnic group in Skopje, with 309,107 inhabitants, or 58.71% of the population. Then came Albanians with 120,293 inhabitants (22.85%), Roma people with 18,498 (3.51%), Serbs (9,478 inhabitants), Turks (8,524), Bosniaks (7,365) and Aromanians (also known as "Vlachs", 2,778). 6,284 people did not belong to any of these groups. Macedonians form an overwhelming majority of the population in the municipalities of Aerodrom, Centar, Ǵorče Petrov, Karpoš and Kisela Voda, which are all south of the Vardar. They also form a majority in Butel and Gazi Baba which are north of the river. Albanians form a majority in Čair which roughly corresponds to the Old Bazaar, and in Saraj. They form a large minority in Butel and Gazi Baba. Šuto Orizari, on the northern edge of the city, is predominantly Roma. When an ethnic minority forms at least 20% of the population in a municipality, its language can become official on the local level. Thus, in Čair and Saraj schools and administration use Albanian, and Romani in Šuto Orizari. The latter is the only municipality in the world where Romani is an official language. Relations between the two largest groups, Macedonians and Albanians, are sometimes difficult, as in the rest of the country. Each group tolerate the other but they tend to avoid each other and live in what can appear as two parallel worlds. Both Macedonians and Albanians view themselves each as the original population of Skopje and the other as newcomers. The Roma minority is on its side very deprived. Its exact size is not known because many Macedonian Roma declare themselves as belonging to other ethnic groups or simply avoid censuses. However, even if official figures are underestimated, Skopje is the city in the world with the largest Roma population. Religion Religious affiliation is diverse: Macedonians, Serbs, and Aromanians are mainly Orthodox, with the majority affiliated to the Macedonian Orthodox Church; Turks are almost entirely Muslim; those of Albanian ethnicity are largely Muslim, although Skopje also has a sizeable Roman Catholic Albanian minority, into which Mother Teresa was born;