The population of Thailand is approximately 67.5 million people, with an annual growth rate of about 0.3 percent.The last official national census was carried out in Thailand back in 2010 and the country’s official population was declared at 65,479,453. Current estimates show a 2014 population in Thailand of 67.2 million, up slightly from 2013’s estimate of 67.1 million, making it the 20th most populous country on earth (a downgrade from its position as number 19 just two years ago).