Place profile
Also known as: Siam
Thailand covers 513,139.5 km² (198,124 sq mi) of land and had a population of 66 million in 2024, about 129 people per km² (333 per sq mi). In more familiar terms, it is about 1.27 times the size of California.
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Calculated from the population and area above; their reference dates may differ.
The closest rung on the US reference ladder (Census Bureau land area); see the sources below.
The inverse of population density, from the same area and population figures.
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National area and registered population reported in Thailand Statistical Yearbook 2025 for year-end 2024.
Average administrative density does not describe population distribution in every neighborhood. Compare population definitions and reference dates alongside the numbers.
| Place | Area km² | Population | Density |
|---|---|---|---|
| Phuket Province | 543 | 429,583 | 791.1 /km² |
| Koh Samui | 227 | 69,689 | 307 /km² |
| Koh Pha-ngan | 168 | 17,268 | 102.8 /km² |
| Koh Chang | 212.4 | 8,728 | 41.1 /km² |
| Koh Tao | 21 | 2,531 | 120.4 /km² |
Place guide
Thailand is a large Southeast Asian country whose national scale is easy to miss when travel concentrates on Bangkok, the north or one island.
The national outline runs from the northern mainland through the central plain to the Malay Peninsula and includes coastal islands.
Area and registered population come from the same official statistical yearbook and share the 2024 year-end reference.
Use Thailand for a country comparison and Koh Samui for a physical-island question.
The explorer may pair Thailand with any place, but fixed guides add boundary-specific interpretation.
Questions people ask
Thailand covers 513,139.5 km², or 198,124 sq mi (reference date 2024-12-31). In US terms: ≈ 1.27 × California.
66 million — 65,951,210 as of 2024-12-31. The scope of that count is set out under “Scope and definitions” on this page.
About 128.5 people per km² (333 per sq mi), derived from the area and population above, whose reference dates may differ. An administrative average does not describe how crowded any particular neighbourhood is.
National area and registered population reported in Thailand Statistical Yearbook 2025 for year-end 2024.
Also written or known as Siam. Every one of those names refers to the place measured on this page.
Outline source: Natural Earth · Public domain
Read the methodology and data notes