Cities in Japan — API & JSON data

6,724 cities. 45 regions. 45 languages. That's the current coverage for Japan in the Geomelon API, led by Tokyo at 14,264,798 people.

Live demo

Top 10 cities by population

City	Region	Population
Tokyo	—	14,264,798
Nagoya metropolitan area	Aichi Prefecture	6,871,532
Yokohama	Kanagawa Prefecture	3,757,630
Osaka	Osaka Prefecture	2,751,862
Fukuoka metropolitan area	—	2,565,501
Nagoya	Aichi Prefecture	2,326,844
Southern Kyoto Prefecture	Kyoto Prefecture	2,316,183
Sapporo	Hokkaido	1,959,313
Fukuoka	Fukuoka Prefecture	1,603,043
Kawasaki	Kanagawa Prefecture	1,539,522

City

Region

Population

Tokyo

—

14,264,798

Nagoya metropolitan area

Aichi Prefecture

6,871,532

Yokohama

Kanagawa Prefecture

3,757,630

Osaka

Osaka Prefecture

2,751,862

Fukuoka metropolitan area

—

2,565,501

Nagoya

Aichi Prefecture

2,326,844

Southern Kyoto Prefecture

Kyoto Prefecture

2,316,183

Sapporo

Hokkaido

1,959,313

Fukuoka

Fukuoka Prefecture

1,603,043

Kawasaki

Kanagawa Prefecture

1,539,522

Sample API response

[ { "id": "08f5568e-d820-4237-adc9-4c681e774221", "name": "Tokyo", "population": 14264798, "countryName": "Japan", "countryCode": "JP", "countryEmoji": "🇯🇵", "regionName": null }, { "id": "b1768339-c040-45d4-b01b-148c2b47b25c", "name": "Nagoya metropolitan area", "population": 6871532, "countryName": "Japan", "countryCode": "JP", "countryEmoji": "🇯🇵", "regionName": "Aichi Prefecture" }, { "id": "69d828fa-067c-4cf0-8051-98c967d2cf9e", "name": "Yokohama", "population": 3757630, "countryName": "Japan", "countryCode": "JP", "countryEmoji": "🇯🇵", "regionName": "Kanagawa Prefecture" } ]

Try it

curl --request GET \
  --url 'https://geomelon.p.rapidapi.com/cities/search?countryCode=jp&sort=population_desc&limit=10' \
  --header 'x-rapidapi-host: geomelon.p.rapidapi.com' \
  --header 'x-rapidapi-key: YOUR_API_KEY'

const res = await fetch(
  'https://geomelon.p.rapidapi.com/cities/search?countryCode=jp&sort=population_desc&limit=10',
  {
    headers: {
      'x-rapidapi-host': 'geomelon.p.rapidapi.com',
      'x-rapidapi-key': 'YOUR_API_KEY',
    },
  },
)
const cities = await res.json()

Multilingual city names

Free dataset

Prefer a static file? Download 1,880 Japan cities as JSON (290 KB, no API key) from the Japan cities dataset page.

FAQ

How many cities in Japan does the API return?

Geomelon currently has 6,724 cities in Japan across 45 regions. Results are paginated, up to 100 per request.

Is there a free tier?

Yes. RapidAPI's free tier covers a fixed number of requests per month with no credit card required. There is also a free, no-key city-autocomplete endpoint (the demo above) for prefix search.

Can I get Japan city names in other languages?

Yes — city names in Japan are available in 45 languages. Pass the languages you want via the preferredLanguages parameter, most-preferred first.

Do I need an API key?

The main search and lookup endpoints require a free RapidAPI key. The prefix-search autocomplete endpoint used in the demo above is public and does not require a key.

🇯🇵 Cities in Japan — API & JSON data