National Statistical Office of Thailand

The National Statistical Office of Thailand (TNSO) (Thai สำนักงานสถิติแห่งชาติ) is the government of Thailand's official statistics surveyor. It is an agency of the Ministry of Information and Communication Technology (MICT). One of its tasks is a nationwide census conducted every 10 years, the latest in 2010.

TNSO has two main administrative branches, central and local, and several other administrative units apart from those two branches. The central administration oversees 11 smaller administrative units: Local administration is composed of 76 Provincial Statistical Offices. TNSO has two other administrative bodies: an Administrative Development Group (กลุ่มงานพัฒนาระบบบริหาร) and an Internal Audit Group (กลุ่มตรวจสอบภายใน).

The predecessor of the National Statistical Office was established on 1 April 1915, by King Vajiravudh as the Department of Statistical Forecasting (กรมสถิติพยากรณ์), under the Ministry of Finance.

In September 1915, King Vajiravudh expanded the department's responsibilities and renamed it the Department of Commerce and Statistical Forecasting (กรมพาณิชย์และสถิติพยากรณ์), still as part of the Ministry of Finance. The first Statistical Yearbook was published for the year 1916.

The Ministry of Commerce was established in August 1920, and regulation over commerce was reassigned to it, with the newly renamed Department of Public Statistical Forecasting (กรมสถิติพยากรณ์สาธารณะ) under the new ministry. However, the statistics department was moved back under the Ministry of Finance in July 1921.

In May 1933, the Department of Public Statistical Forecasting was once again reorganized under the Department of Commerce, Ministry of Finance, this time as a division (กอง), a lower administrative unit than a department, with its named changed to the Division of Statistical Forecasting Compilation (กองประมวลสถิติพยากรณ์).

In October 1935, the Division of Statistical Forecasting Compilation was moved under the jurisdiction of the Secretariat of the Cabinet, Office of the Prime Minister (กรมเลขาธิการคณะรัฐมนตรี สำนักนายกรัฐมนตรี).

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