Kingdom of Bhutan འབྲུག ་ རྒྱལ ་ ཁབ ་ (Dzongkha) Druk Gyal Khap Flag Emblem Anthem: Druk tsendhen "The Thunder Dragon Kingdom '' Capital and largest city Thimphu 27 ° 28.0 ′ N 89 ° 38.5 ′ E ﻿ / ﻿ 27.4667 ° N 89.6417 ° E ﻿ / 27.4667; 89.6417 Official languages Dzongkha Religion Buddhism Hinduism Demonym Bhutanese Government Unitary parliamentary constitutional monarchy King Jigme Khesar Namgyel Wangchuck Prime Minister Dasho Tshering Wangchuk (as Chief Advisor) Legislature Parliament Upper house National Council Lower house National Assembly Formation Unification of Bhutan 1616 -- 1634 House of Wangchuck 17 December 1907 Indo - Bhutan Treaty 8 August 1949 UN membership 21 September 1971 Democratic Constitutional monarchy 18 July 2008 Area Total 38,394 km (14,824 sq mi) (133rd) Water (%) Population 2016 estimate 797,765 (165th) 2005 census 634,982 Density 19.3 / km (50.0 / sq mi) (196th) GDP (PPP) 2018 estimate Total $7.701 billion Per capita $9,426 (115th) GDP (nominal) 2018 estimate Total $2.547 billion Per capita $3,117 (130th) Gini (2012) 38.7 medium HDI (2017) 0.612 medium 134th Currency Ngultrum (BTN) Time zone UTC + 6 (BTT) Driving side left Calling code + 975 ISO 3166 code BT Internet TLD. bt The population of Bhutan had been estimated based on the reported figure of about 1 million in the 1970s when the country had joined the United Nations and precise statistics were lacking. Thus, using the annual increase rate of 2 -- 3 %, the most population estimates were around 2 million in the year 2000. A national census was carried out in 2005 and it turned out that the population was 672,425. Consequently, United Nations Population Division reduced its estimation of the country 's population in the 2006 revision for the whole period from 1950 to 2050.
which country is known as land of thunder dragon
Kingdom of Bhutan