Kingdom of Thailand

69,306,160 19

Population (as of Feb. 8, 2019)

Elections in our database

51,419,975 66.92%

Registered Voters (as of April 4, 2019)

Average Turnout

Name Official Name Type
Thai House of Representatives Sapha Phuthaen Ratsadon Lower House
Thai Senate Wuthisapha Upper House

Description of government structure:

  • Chief of State: King MAHA Vajiralonkorn
  • Head of Government: Prime Minister Gen. PRAYUT Chan-ocha
  • Assembly: Thailand has a bicameral National Assembly (Rathasapha) consisting of the Senate (Wuthisapha) with 250 seats and the House of Representatives (Sapha Phuthaen Ratsadon) with 500 seats.

Description of electoral system:

  • The King is the hereditary head of state.
  • The Prime Minister is appointed by the monarch to serve a 4-year term.
  • Members of the Senate are appointed for five-year terms.
  • In the House of Representatives (Sapha Phuthaen Ratsadon), 350 members are elected by plurality vote in single-member constituencies to serve 4-year terms and 150 members are elected through a closed-list proportional representation system to serve 4-year terms.
  • The new Constitution elaborates a new mixed member apportionment electoral system. Despite there being two separate types of seats to fill in this new system voters make only one “fused” choice on the ballot. A voter’s mark on the ballot will now indicate their choice of a constituency representative and their choice of a political party as the basis for the distribution of the 150 party list seats (see below). These decisions were separate under Thailand’s previous mixed system (i.e., voters were given two marks and the latitude to choose a local constituency representative from one party and a party list from another party).  Distribution of the party list seats are now determined by each party’s share of the popular fused vote. The number of single-member seats won are subtracted from the share of all 500 seats a party would receive based on the popular vote. The remainder is roughly the number of PR seats awarded to that party. For example, if a party won 20% of the vote and 55 single-member constituency seats, they would be awarded roughly 45 PR seats: 100 seats (20% of 500) less the 55 single-member constituency seats. This compensatory mechanism for awarding the 150 party list seats is also different from previous Thai electoral systems and is likely to affect parties’ election strategies.
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Election For Date Votes Registered Voters Turn Out
Thai Senate 2000-03-04 30,684,040 38,000,000 80.75%
Thai House of Representatives 2001-01-06 16,699,549 42,875,036 38.95%
Thai House of Representatives 2001-01-06 - 42,875,036 -
Thai Senate 2006-04-02 - 45,232,145 -
Thai House of Representatives 2006-04-02 - 45,232,145 -
Thai Senate 2006-04-19 - 45,232,145 -
Thai House of Representatives 2006-04-19 - 45,232,145 -
Thai Senate 2006-04-23 - 45,232,145 -
Thai House of Representatives 2006-04-23 - 45,232,145 -
Referendum 2007-08-19 25,978,954 45,092,955 57.61%
Thai Senate 2007-12-23 - 44,002,593 -
Thai House of Representatives 2007-12-23 38,981,412 44,002,593 88.59%
Thai Senate 2008-03-02 24,981,233 44,911,254 55.62%
Thai House of Representatives 2008-03-02 - 44,911,254 -
Thai Senate 2011-07-03 - 44,002,593 -
Thai House of Representatives 2011-07-03 35,209,607 44,002,593 80.02%
Thai House of Representatives 2014-02-02 - 48,000,000 -
Referendum 2016-08-07 29,740,677 50,071,589 -
Thai House of Representatives 2019-03-24 35,541,520 51,419,975 -

Voter Turnout