- 5 largest city in Thailand: Bangkok, Samut Prakan, Nonthaburi, Changwat Udon Thani, Chon Buri
- Population of the largest city: Bangkok has the population of 5,104,476
- Rank Size Rule: Samut Prakan-2,500,000. Nonthaburi-1,666,666. Changwat Udon Thani-1,250,000. Chon Buri -1,000,000
- Actual populations of the 2nd, 3rd, 4th, & 5th largest cities: Samut Prakan-388,920. Nonthaburi-291,555. Changwat Udon Thani-247,237. Chonburi-219,164
- The Rank-size Rule does not apply to Thailand because the population difference between the largest city and the 4 next largest city is too great. This is one of those cases where other cities in a country depend too much on their primate city, in this case Bangkok, for businesses, political center, and urban attractions. If anything were to effect Bangkok it would effect the entire country as well.
- Total Population: 67,741,401
- Population Density: 131 per Sq.Km
- % Urban Population: 34.1% of total population (2011)
- Rate of urbanization: 1.6% annual rate of change (2010-15 est.)
- % with Improved Urban Sanitation: 88.7% of population
- % with Improved Urban Water Supply: 96.7% of population