Thailand's population is dominated by various Tai-speaking peoples. Among these, the most numerous are the Central Thai, the Northeastern Thai or Isan or Lao, the Northern Thai, and the Southern Thai. The Central Thai have long dominated the nation politically, economically, and culturally, even though they make up only about one-third of Thailand's population and are slightly outnumbered by the Northeastern Thai. Due to education system and the forging of a national identity, many people are now able to speak Central Thai as well as their own local dialects.
The largest group of non-Thai people are the Chinese who have historically played a disproportionately significant role in the economy. Most have integrated completely into mainstream Thai society, and do not live in Bangkok's Chinatown on Yaowarat Road. Other ethnic groups include Malays in the south, Mon, Khmer and various hill tribes. After the end of the Vietnam War, many Vietnamese refugees settled in Thailand, mainly in the northeastern regions.
According to the last census (2000) 95% of Thais are Buddhists of the Theravada tradition. Muslims are the second largest religious group in Thailand at 4.6%. Some provinces and towns south of Chumphon have dominant Muslim populations, including many ethnic Thai.[verification needed] Often Muslims live in separate communities from non-Muslims. The southern tip of Thailand are mostly ethnic Malays and they are mostly concentrated in the south, where they form a strong majority in four provinces. Christians, mainly Catholics, represent 0.75% of the population. A tiny but influential community of Sikhs and some Hindus also live in the country's cities.
The Thai language is Thailand's national language, written in its own alphabet, but many ethnic and regional dialects exist as well as areas where people speak predominantly Isan or Mon-Khmer languages. Although English is widely taught in schools, proficiency is low.
additional information from Wikipedia
Search