Miercurea Ciuc (; , ; ) is the county seat of Harghita County, Romania. It lies in the Székely Land, a mainly Hungarian-speaking ethno-cultural region in eastern Transylvania, and is situated in the Olt River valley. The city administers three villages: Ciba / Csiba Harghita-Băi / Hargita-fürdő Jigodin-Băi / Zsögöd-fürdő, including Jigodin / Csíkzsögöd Demographics According to the census of 2011, there were 37,980 people living in the city. Of this population, 81.39% are ethnic Hungarians, while 17.4% are ethnic Romanians, 0.9% are ethnic Romani, and 0.33% declare other nationalities. According to the census of 2002, there were 42,029 people living in the city. Of this population, 81.75% are ethnic Hungarians, while 17.3% are ethnic Romanians, 0.62% are ethnic Romani and 0.33% declare other nationalities. Demographic movements according to census data: Roman Catholicism is the majority religion of Miercurea Ciuc, its adherents numbering 74.06% of the total population. Romanian Orthodox (14.99%), Hungarian Reformed (7.41%), and Unitarian (2.05%) adherents represent the most significant other religious groups. History The remains of three Dacian fortifications were found in the Jigodin neighbourhood of Miercurea Ciuc; they belong to the Dacian culture of the 1st century. In the Middle Ages it was the capital of Csíkszék (Csik seat). Between 1876 and 1918, Csíkszereda was the seat of Csík County of the historical Szeklerland in the Kingdom of Hungary. After the Treaty of Trianon in 1920, it became part of Kingdom of Romania, and was seat of the Ciuc County between 1927 and 1938. Miercurea Ciuc became part of Hungary again between 1940 and 1944 as a result of the Second Vienna Award. In 1944, the Soviet Red Army captured the town. It was returned to Romania in 1945, a move confirmed by the Paris Peace Treaties of 1947. Between 1952 and 1960, the town was part of the Magyar Autonomous Region, later named the Mureș-Magyar Autonomous Region between 1960 and 1968. In 1968, Miercurea Ciuc became the county seat of Harghita County. In the post-World War II period, the town was industrialized; among other projects, a tractor factory, a textile factory and, in the 1960s, a beer factory were built here. The factory is now owned by Heineken. The Ciuc Beer products have gained an increasing popularity in Romania. Climate Miercurea Ciuc has a cool continental climate (Köppen climate classification: Dfb - without a dry season, although summer is wetter than winter and with a