Place profile

How big is Green Island?

Green Island covers 15.1 km² (5.83 sq mi) of land and had a population of 4,327 in 2025, about 287 people per km² (743 per sq mi). In more familiar terms, it is about 26% of Manhattan.

Compare this place

Area: 15.1 km² · 5.83 sq mi
Source accessed: 2026-09-05
Population: 4,327
Reference date: 2025-12-31
Population density: 286.7 people/km² · 743 per sq mi
Calculated from the population and area above; their reference dates may differ.
On a familiar scale: ≈ 26% of Manhattan (reference rung)
The closest rung on the US reference ladder (Census Bureau land area); see the sources below.
Land per resident: 3,488 m² of land per resident
The inverse of population density, from the same area and population figures.

The outline is fitted to this frame, not a map for measuring distances. Outlying islands may make the main landmass appear smaller.

Scope and definitions

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.

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 Green Island profile be read?

Green Island is a compact volcanic island off Taiwan’s southeast coast. The physical island area is paired with year-end registered population for Green Island Township.

A nearly aligned island and township

The township and physical island are nearly coextensive, giving a practical local population numerator for the island area.

The record still labels population as an administrative count so the definition remains explicit.

Use it as a small-island reference

Green Island gives Taiwanese readers a familiar scale below Penghu County and far below Koh Samui.

Travel time and crowding still require roads, terrain, sailings and visitor data beyond area and residents.