Place comparison

Japan compared with California: area, population and density

Japan is about 94% of California’s land area but has about 3.1 times its population, so Japan is about 3.4 times as dense.

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 guide below belongs to this pair: Japan and California. Change the selector above and the page follows, so the reading always matches the tool.

Direct answer

How different are Japan and California?

Japan covers 377,975.6 km² (145,937 sq mi); Japan's area is about 93.6% of California's. Its reported population is 123,802,000; Japan's population is 3.15 times California's. By average density, Japan's population density is 3.36 times California's.

Area difference

Japan's area is about 93.6% of California's 377,975.6 km² (145,937 sq mi) · 403,676.6 km² (155,860 sq mi)

Population difference

Japan's population is 3.15 times California's 123,802,000 · 39,355,309

Density difference

Japan's population density is 3.36 times California's 327.5 /km² (848 /sq mi) · 97.5 /km² (253 /sq mi)

Full data and sources for each place: Japan area & population, California area & population

Straight-line distance between geometric centres: about 8580 km; time difference: 17 hours (16 hours during daylight saving time).

On a familiar scale

Japan ≈ 56% of Texas 3,053 m² of land per resident
California ≈ 60% of Texas 10,257 m² of land per resident

Reference scales come from U.S. Census Bureau: 2025 Gazetteer Files: land area of states and counties , as of 2025-01-01.

How to read it

Nearly the same size — Japan is slightly smaller than California — but with more than three times the people.

Geography and shape

Japan and California are the classic same-size pair: both long, mountainous and facing the Pacific. California runs about 1,240 km north to south; Japan’s islands stretch about 3,000 km, so Japan’s outline covers a longer arc even though its land area is a little smaller.

Population context

Japan has an estimated 123,802,000 people on 377,976 km², about 328 per km². California has an estimated 39,355,309 on 403,677 km² of land, about 97 per km². The same amount of land holds more than three times as many people in Japan.

Boundaries and definitions

Japan’s area is the national total from the Geospatial Information Authority, which includes lakes and the Northern Territories; California’s is land only, excluding 20,289 km² of water. Using California’s land-plus-water total of 423,965 km², Japan is about 89% of California instead of 94% — smaller either way. Japan’s population is the official estimate for 1 October 2024; California’s is the Census Bureau’s estimate for 1 July 2025.

Japan: Total population estimate and national territory area.

California: The State of California: 403,676.56 km² of land and 39,355,309 residents. Area is the Census Bureau’s land area (ALAND) for the state in the 2025 Gazetteer, which excludes inland and coastal water — another 20,289 km², so the land-plus-water total is 423,965 km². Population is the Census Bureau’s Vintage 2025 resident estimate for 1 July 2025, not a census count. The outline is Natural Earth’s admin-1 polygon for California, including the Channel Islands, and measures about 1.5% larger than the official land area because its coastline encloses bays such as San Francisco Bay. California uses Pacific Time (UTC−8, UTC−7 in summer).

In-depth guide

How should Japan and California be understood in context?

“Japan is about the size of California” is one of the most repeated size comparisons in English, and it holds up: Japan has about 94% of California’s land. The difference is people — Japan has about 3.1 times as many.

Same land, three times the people

Japan’s 377,976 km² against California’s 403,677 km² of land makes Japan about 6% smaller. Japan’s 123.8 million people against California’s 39.4 million puts Japan at about 328 people per km² and California at about 97.

The comparison is sensitive to how water is counted. Japan’s official area includes its lakes; California’s land area does not include its 20,289 km² of water. Add that water and Japan comes to about 89% of California — still smaller, and still in the same size class.

Questions people ask

About this geographic comparison

Which is bigger, Japan or California?

California is bigger, with a land area about 1.07× that of Japan (Japan 377,975.6 vs California 403,676.6 km², or 145,937 sq mi vs 155,860 sq mi).

How big is Japan compared to California?

California has 403,676.6 km² (155,860 sq mi) and Japan has 377,975.6 km² (145,937 sq mi): the ratio is 1.07×. Conversely, Japan has 93.6% of California's area.

Does Japan or California have more people?

Japan has 123,802,000 people (2024-10-01), versus 39,355,309 in California (2025-07-01): 3.15×. In reverse, California has 31.8% of Japan's population. Japan is 93.6% the size of California — 377,975.6 km² vs 403,676.6 km² (145,937 sq mi vs 155,860 sq mi). Population is 3.15× higher; average density is 3.36× higher. Each side’s scope and reference date are set out under “Boundaries and definitions” on this page.

Is Japan bigger than California?

No. California is bigger, with a land area about 1.07× that of Japan (Japan 377,975.6 vs California 403,676.6 km², or 145,937 sq mi vs 155,860 sq mi). The area difference is 25,700.9 km². California has 403,676.6 km² (155,860 sq mi) and Japan has 377,975.6 km² (145,937 sq mi): the ratio is 1.07×. Conversely, Japan has 93.6% of California's area. No, slightly smaller: 377,976 km² against California’s 403,677 km² of land, about 94%. Japan has about 3.1 times California’s population.

Why does Japan look bigger than California on a map?

Because its land is spread along an arc of islands about 3,000 km long, so its outline spans more distance than California’s. Common web maps also enlarge places the farther they are from the equator, and most of Hokkaido lies north of California’s northern border.

Sources

Outline data:

Natural Earth · Public domain