Head of State : His Majesty King Bhumibol Adulyadej Head of Government : Prime Minister General Prayut Chan-o-cha Capital : Bangkok Language : Thai Currency : Baht Area: 513,119.5 km2 Population: 68.9 million (2015) GDP at current market prices: USD 395.7 billion (2015) GDP per capita: USD 5,736.9 (2015) Website:Ministry of Commerce of Thailand