Prefecture of Japan
Okayama
岡山県Okayama is a prefecture of Japan. It covers about 6,930 km² (2,680 mi²), the 18th largest of the 47 prefectures in Natural Earth’s file for Japan, and 1.21× the size of Brunei. About 1.9 million people live there (Wikidata, 2021).
50 km
- Okayama
- Brunei
Facts
| Area, measured | 6,930 km²2,680 mi² |
|---|---|
| Official area | 7,110 km²Wikidata · 2.5% above our measure |
| Share of Japan | 1.9%of the area of the 47 prefectures |
| Rank by area | 18th of 47prefectures of Japan |
| Population | 1.9 millionWikidata, 2021 |
| Density | 271 people per km² |
| Capital | Okayama |
| Latitude range | 34°N to 35°N |
| Type | PrefectureJP-33 |
What the numbers say about Okayama
- Okayama covers 1.9% of the area of Japan and ranks 20th of 47 by population, against 18th by area.
- It would take 53.9 prefectures the size of Okayama to cover Japan.
- The largest, Hokkaido (Japan), is 11.4× the size of Okayama; the smallest, Kagawa, is 27% of it.
- Closest in size within Japan: Shimane (6,880 km², 1.01×) and Kochi (7,090 km², 1.02×).
- Counted as a country, Okayama would be larger than 69 of the 239 countries and territories listed on sizeversus, and would rank 171st by area, between French Southern and Antarctic Lands (6,990 km²) and Palestine (6,070 km²).
- With 1.9 million people it would rank 149th of 238 by population.
- Okayama has 271 people per km², about the density of Trinidad and Tobago, which has 267 per km².
- That makes Okayama the 24th most densely populated of the 47 prefectures, 80% of the average for Japan (338 per km²).
- On a standard web map (Web Mercator), a place at 35°N is drawn about 1.5× too large in area, so Okayama looks bigger there than it is.
- Laid out flat, Okayama stretches about 100 km north to south and 103 km east to west.
- Our measured 6,930 km² is 2.5% below Wikidata's official figure of 7,110 km². Official figures can include inland water or count land that an outline draws differently.
About the same size as
Beside the regions of other countries
The closest region by area and by people in each of the other countries that have regional pages here, within a factor of 2. All 395 regions side by side.
- ChinaAreaShanghai1.03× · 6,750 km²PeopleTibet52% · 3.6 million (2020)
- United StatesAreaDelaware1.34× · 5,170 km²PeopleIdaho1.02× · 1.8 million (2020)
- IndiaAreaSikkim1.00× · 6,940 km²PeopleNagaland0.95× · 2.0 million (2011)
- GermanyAreanone within 2×PeopleHamburg0.99× · 1.9 million (2022)
- FranceAreaCorsica (France)80% · 8,670 km²PeopleCentre-Val de Loire73% · 2.6 million (2022)
- ItalyAreaFriuli-Venezia Giulia0.94× · 7,340 km²PeopleCalabria0.96× · 1.9 million (2019)
- SpainAreaBasque Country0.98× · 7,060 km²PeopleCastilla–La Mancha90% · 2.1 million (2024)
- BrazilAreaFederal District1.20× · 5,790 km²PeopleSergipe85% · 2.2 million (2022)
- CanadaAreaPrince Edward Island1.21× · 5,730 km²PeopleManitoba1.40× · 1.3 million (2021)
- AustraliaAreanone within 2×PeopleSouth Australia0.99× · 1.9 million (2024)
- MexicoAreaColima1.18× · 5,880 km²PeopleQuintana Roo1.01× · 1.9 million (2020)
- ThailandAreaPrachuap Khiri Khan1.00× · 6,930 km²PeopleUbon Ratchathani1.01× · 1.9 million (2020)
Where Okayama sits in Japan
All 47 drawn on one equal-area map, so sizes are comparable. Select another to open it.
Compare Okayama
- South Australia vs Okayama
- Quintana Roo vs Okayama
- Ubon Ratchathani vs Okayama
- Sikkim vs Okayama
- Okayama vs Brunei
- Okayama vs Cyprus
- Guinea-Bissau vs Okayama
- Montenegro vs Okayama
- Okayama vs Prince Edward Island
- Okayama vs Shanghai
- Okayama vs Federal District
- Okayama vs Delaware
- Okayama vs Colima
- Basque Country vs Okayama
- Corsica (France) vs Okayama
- Friuli-Venezia Giulia vs Okayama
- Okayama vs Prachuap Khiri Khan
- Okayama vs Hamburg
Share this outline
Sources and method
- Outline
- Natural Earth, 1:10m Admin 1 - States, Provinces, public domain
- Boundary
- De facto, as drawn by Natural Earth.
- Area
- Measured on the WGS84 ellipsoid from the full-detail outline, shown rounded. The region’s whole area is counted, every island included.
- Official figures
- Area, population and capital from Wikidata (CC0), fetched 2026-11-12
- Population
- Wikidata, 2021. Japan’s units share the 2021 figures where Wikidata has them; the year is shown wherever the figure is.
- Matching
- Countries come from Natural Earth’s country file. Places whose status is contested and dependencies are never used as automatic matches. A region under 2,500 km² is matched against the small countries and island nations.
- Data built
- 2026-11-12