The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in Central Thailand, and has a population of over 8 million, or 12.6 percent of the country's population.Over 14 million people (22.2 percent) lived within the surrounding Bangkok Metropolitan Region at the 2010 census, making Bangkok an extreme primate city, significantly dwarfing Thailand's other urban centres in terms of importance.Today, the city is known in Thai as Krung Thep Maha Nakhon (กรุงเทพมหานคร) or simply as Krung Thep (กรุงเทพฯ).
The City Pillar was erected on 21 April, which is regarded as the date of foundation of the present city.
Disproportionate urban development led to increasing income inequalities and unprecedented migration from rural areas into Bangkok; its population surged from 1.8 million to 3 million in the 1960s.
Following the United States' withdrawal from Vietnam in 1973, Japanese businesses took over as leaders in investment, and the expansion of export-oriented manufacturing led to growth of the financial market in Bangkok.
The Asian investment boom in the 1980s and 1990s led many multinational corporations to locate their regional headquarters in Bangkok.
The city is now a major regional force in finance and business.