Tiachiv Raion is a raion in Zakarpattia Oblast in western Ukraine. Its administrative center is Tiachiv. Population: On 18 July 2020, as part of the administrative reform of Ukraine, the number of raions of Zakarpattia Oblast was reduced to six, and the area of Tiachiv Raion was significantly expanded. According to the 2001 census, the majority of the population of the Teceu district spoke Ukrainian (83.52%), with Romanian (12.45%), Hungarian (2.76%) and Russian (1.06%) speakers in the minority. The January 2020 estimate of the raion population was Romanian became in September 2012 a regional language in the village of Bila Tserkva; meaning it was allowed to be used in the towns administrative office work and documents. This was made possible after new legislation on languages in Ukraine was passed in the summer of 2012. The Constitutional Court of Ukraine on 28 February 2018 ruled this legislation unconstitutional. The raion has one city: Tiachiv, and five urban-type settlements: Bushtyno, Dubove, Solotvyno, Teresva and Ust-Chorna.