Island and municipality
The municipality reports 252 km² in total, of which the main island accounts for 227 km².
Atlas uses the recognisable island outline for area while explaining that population has the wider municipal scope.
Place profile
Koh Samui
Area, population and population density of Koh Samui, with reference dates, geographic scope, official sources and an outline preview.
Compare this place- Area
- 227 km²
Source accessed:
- Population
- 69,689
Reference date:
- Population density
- 307 people/km²
Calculated from the population and area above; their reference dates may differ.
- On a familiar scale
- ≈ 84% of Taipei City
The closest rung on the Taiwan reference ladder; see the sources below.
- Land per resident
- 3,257 m² of land per resident
The inverse of population density, from the same area and population figures.
Scope and definitions
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.
Average administrative density does not describe population distribution in every neighborhood. Compare population definitions and reference dates alongside the numbers.
Place guide
How should this Koh Samui profile be read?
Koh Samui is represented by the 227 km² physical main island. Its best current official population is municipal and covers eighteen additional islands, making density approximate.
Good uses and limits
Area comparisons with Penghu, Hong Kong and Green Island remain useful for visual scale.
Density should remain labelled approximate and must not be used to predict tourist crowding.
Data sources
- Ko Samui City Municipality: General information: municipal and main-island area
- National Statistical Office, Thailand: Surat Thani Provincial Statistical Report 2025, Table 1.2
- Department of Household Registration, Ministry of the Interior: Land area, households and population density by township and district (year-end 2025) · reference ladder
Outline source: © OpenStreetMap contributors · ODbL · source feature
Read the methodology and data notesRelated comparisons
- Koh Samui compared with Penghu: area, population and density
- Koh Samui compared with Hong Kong: area, population and density
- Green Island compared with Koh Samui: area, population and density
- Phuket compared with Koh Samui: area, population and density
- Koh Pha-ngan compared with Koh Samui: area, population and density
- Phu Quoc Island compared with Koh Samui: area, population and density