Place comparison
Green Island compared with Koh Samui: area, population and density
Koh Samui has about fifteen times Green Island’s land area and a far larger resident count, while their approximate average densities are surprisingly close.
Equal-area outline comparison
Outlines are centered and scaled by official land area; position does not show geographic location.
Area
Population
Population density
Area data date
Population data date
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The detailed guide below compares Green Island with Koh Samui. Use the selector above to explore any other pair.
Direct answer
How different are Green Island and Koh Samui?
Green Island covers 15.1 km²; Green Island's area is about 6.6% of Koh Samui's. Its reported population is 4,327; Green Island's population is about 6.2% of Koh Samui's. By average density, Green Island's population density is about 93.4% of Koh Samui's.
Population difference
Green Island's population is about 6.2% of Koh Samui's 4,327 · 69,689Density difference
Green Island's population density is about 93.4% of Koh Samui's 286.7 /km² · 307 /km²On a familiar scale
- Green Island ≈ 52% of Matsu (Lienchiang County) 3,488 m² of land per resident
- Koh Samui ≈ 84% of Taipei City 3,257 m² of land per resident
Reference scales come from Department of Household Registration, Ministry of the Interior: Land area, households and population density by township and district (year-end 2025) , as of 2025-12-31.
How to read it
The near-density result is only a first-order comparison because Koh Samui population includes 18 surrounding municipal islands.
Geography and shape
Green Island is a compact volcanic island off Taiwan’s southeast coast. Koh Samui is a much larger Gulf of Thailand island with a wider road and settlement network. Putting both outlines on one scale makes the fifteen-fold area gap immediately visible.
Population context
The reported population ratio broadly follows the area ratio, which produces similar rough densities. Green Island uses township registered population; Koh Samui uses a municipal total whose geographic reach is wider than its main-island outline.
Boundaries and definitions
Green Island pairs a physical island with its nearly coextensive township population. Koh Samui pairs its physical island with a municipality covering the main island and 18 others. Area comparison is clean; density needs the displayed scope note.
Green Island: Physical Green Island area paired with the registered population of Green Island Township at year-end 2025. The township and main island are nearly coextensive, but the population remains an administrative count.
Koh Samui: Area is for Koh Samui main island. Population is the 2024 Ko Samui City Municipality total, whose 252 km² administration includes the 227 km² main island and 18 surrounding islands; density is therefore approximate for the main island.
In-depth guide
How should Green Island and Koh Samui be understood in context?
Green Island and Koh Samui offer a clean visual contrast between a compact Taiwanese island and a much larger Thai resort island. The roughly fifteenfold land gap is more informative than either number alone.
Two physical islands on one scale
Both outlines refer to physical islands, so the area comparison is straightforward. Koh Samui’s main island is about fifteen times Green Island by land.
That difference changes route choices, settlement spread and the practical meaning of staying in one part of the island. It does not by itself determine travel time.
A surprisingly similar rough density
Reported population increases by a broadly similar multiple, creating close average densities. The resemblance is useful as a prompt, not a claim that the two islands feel alike.
Hotels, visitors, roads, terrain and where residents cluster are all absent from the calculation.
Population boundaries are not equally clean
Green Island Township nearly matches the island and provides the registered total. Ko Samui Municipality includes eighteen additional islands beyond the main-island outline.
Readers can trust the area ratio directly and should treat the density comparison as approximate until a main-island-only population becomes available.
Questions people ask
About this geographic comparison
How many Green Islands fit inside Koh Samui?
By land area, the 227 km² Koh Samui main island is about fifteen Green Islands.
Are both population figures island-only counts?
Not exactly. Green Island uses township population, while Koh Samui’s municipality includes 18 surrounding islands.
Can density predict the travel experience?
No. Seasonal visitors, roads, resort concentration and terrain are outside this resident-and-land calculation.
Sources
- Green Island Township Representatives Council: Geographic environment and area of Green Island Township
- Taitung County Household Registration Office: Green Island Township population and Indigenous population, December 2025
- Ko Samui City Municipality: General information: municipal and main-island area
- National Statistical Office, Thailand: Surat Thani Provincial Statistical Report 2025, Table 1.2
Outline data: