Place comparison

Jeju compared with Penghu: area, population and density

Jeju Province has many times Penghu County’s land and several times its residents, while Penghu remains the more densely settled of the two.

Place A Grouped by country or region Place B Grouped by country or region

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

The detailed guide below compares Jeju Province with Penghu County. Use the selector above to explore any other pair.

Direct answer

How different are Jeju Province and Penghu County?

Jeju Province covers 1,850.3 km²; Jeju Province's area is 14.5 times Penghu County's. Its reported population is 674,817; Jeju Province's population is 6.25 times Penghu County's. By average density, Jeju Province's population density is about 43.3% of Penghu County's.

Area difference

Jeju Province's area is 14.5 times Penghu County's 1,850.3 km² · 128 km²

Population difference

Jeju Province's population is 6.25 times Penghu County's 674,817 · 107,901

Density difference

Jeju Province's population density is about 43.3% of Penghu County's 364.7 /km² · 843.2 /km²

On a familiar scale

Jeju Province ≈ 63% of Kaohsiung City 2,742 m² of land per resident
Penghu County ≈ 84% of Kinmen County 1,186 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

One province built around a single volcanic island against a county whose land is split across ninety of them.

Geography and shape

Jeju is dominated by one volcanic island with a mountain at its centre, so almost all of its land is continuous and reachable by road. Penghu County spreads a much smaller total across an archipelago, where moving between inhabited islands means bridges or boats. The land ratio and the travel experience therefore diverge sharply.

Population context

Jeju has several times Penghu’s residents but many times its land, so Penghu ends up with the higher average density. Both are averages across their full administrative scope, including sparsely settled uplands on one side and uninhabited islands on the other.

Boundaries and definitions

Jeju here is the whole province, not the main island: the area covers Udo, the Chuja group and dozens of smaller islets, and the population is the provincial census total. No Korean government body publishes an area for the main island alone. The outline shown is the main island’s coastline, because the mapped provincial boundary is a maritime jurisdiction line enclosing mostly open sea, so the Chuja Islands are counted in the figures but absent from the outline. Penghu uses the county’s official inventory of 90 islands with its registered year-end population.

Jeju Province: Jeju Special Self-Governing Province, not the main island alone. The area is the province's registered cadastral land at 31 December 2024, covering the main island plus Udo, the Chuja group, Gapado, Marado, Biyangdo and dozens of smaller islets; the population is the province's at the 1 November 2024 register-based census. The main island by itself is roughly 0.9% smaller in area and 0.5% smaller in population, but no Korean government body publishes an area for it alone, so no separate island entry is possible. The outline drawn here is the main island's coastline rather than the provincial boundary, because the mapped provincial relation is a maritime jurisdiction line enclosing about 11,100 km² of mostly open sea. The Chuja Islands, some 50 km north, are therefore counted in the figures but do not appear in the outline.

Penghu County: The full Penghu County archipelago: 90 islands in the county inventory. Population is the registered year-end total; the area figure is the current official inventory accessed September 4, 2026.

In-depth guide

How should Jeju Province and Penghu County be understood in context?

One province built around a single volcanic island is set here against a county whose land is split across ninety of them. Continuous land produces road distance; scattered land produces sea crossings.

Continuous land and scattered land

Jeju Province is 1,850.3 km² and almost all of it is continuous, reachable by road from a single network. Penghu County is 127.9636 km² across the county’s inventory of 90 islands, so moving between inhabited islands means a bridge or a boat. The same square kilometres arranged in these two ways do not produce the same journeys.

This is the same point the Okinawa-and-Penghu and Miyako-and-Penghu pages make, applied to a much larger continuous landmass. A land ratio compares totals, not the arrangement those totals take. Arrangement is what decides how you get from one settlement to the next.

The entry is the province, the outline is not

Jeju here is the whole province rather than the main island, because no Korean government body publishes an area for the main island alone. The area therefore covers Udo, the Chuja group and dozens of smaller islets, and the population of 674,817 is the provincial census total. A province-level entry is the only one that can be sourced.

The outline drawn beside those figures is nonetheless the main island’s coastline. The mapped provincial boundary is a maritime jurisdiction line enclosing mostly open sea, which would show scale rather than land. The Chuja Islands are consequently counted in the numbers and absent from the shape, and that is disclosed instead of smoothed over.

The smaller side is the denser one

Penghu is the denser of the two despite being far smaller, because its share of residents in this pairing is larger than its share of land. With 107,901 registered residents on that county total, the arithmetic follows directly. Nothing about the result is paradoxical once the two shares are read together.

Both figures are averages across full administrative scope. Jeju’s includes uplands with little settlement; Penghu’s includes the uninhabited islands in the county inventory. Neither average describes any particular town on either side.

Questions people ask

About this geographic comparison

Is this Jeju Island or Jeju Province?

The province. Korean statistics are compiled by administrative district and no official source publishes the main island’s area on its own, so a province-level entry is the only one that can be sourced.

How different would the main island alone be?

Roughly 0.9% less land and 0.5% fewer people, based on the attached islands’ own registered populations. The difference is small, but it is a different geographic object.

Why is Penghu denser despite being smaller?

Its share of residents is larger than its share of land in this pairing. Density is population divided by land, so a small place with proportionally more people comes out higher.

Sources

Outline data: