Jeju compared with Hawaii: area, population and density

Geography and shape

Jeju is a single volcanic island off the southern tip of the Korean Peninsula, with a few small islets, governed as one province. Hawaii is an archipelago of volcanic islands in the middle of the North Pacific, with Hawaiʻi Island making up about 63% of its land.

Population context

Jeju Province has 674,817 people on 1,850 km², about 365 per km². Hawaii has an estimated 1,432,820 on 16,634 km² of land, about 86 per km². Hawaii has about 2.1 times Jeju’s population on about 9 times its land.

Boundaries and definitions

Jeju uses its register-based census for 1 November 2024 and the province’s registered land, main island plus islets. Hawaii uses the Census Bureau’s Vintage 2025 estimate for 1 July 2025 and the state’s land area, which leaves out 11,777 km² of inland and coastal water. The population dates are eight months apart.

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.

Hawaii: The State of Hawaii: 16,634.44 km² of land and 1,432,820 residents. Area is the Census Bureau’s land area (ALAND) for the state in the 2025 Gazetteer; it excludes 11,777 km² of inland and coastal water, so the land-plus-water total is 28,412 km². Population is the Census Bureau’s Vintage 2025 resident estimate for 1 July 2025, not a census count. Hawaiʻi Island (Hawaii County) is about 63% of the land, while Honolulu County on Oʻahu holds about 69% of the residents. The outline is Natural Earth’s admin-1 polygon showing the eight main islands; the tiny Northwestern Hawaiian Islands, strung out nearly 2,000 km further northwest, are counted in the area but not drawn. The drawn islands measure about 1.5% more than the official land area. Hawaii keeps Hawaii–Aleutian Standard Time (UTC−10) all year and does not observe daylight saving time.