Iwai Population 2026
Iwai has a population of 16,958, making it the #1149 biggest city in 🇯🇵 Japan, located in Tokyo. It is about 574× smaller than Tokyo, the country's biggest city.
Population (city proper)
16,958
Rank in Japan
#1149
Coordinates
35.75°N, 139.23°E
~321 m elevation · Asia/Tokyo
Distance to capital (Tokyo)
42 km
26 miles, straight line
Other big cities in Tokyo
| City | Population | Rank in Japan |
|---|---|---|
| Tokyo | 9,733,276 | #1 |
| Ōta | 748,081 | #18 |
| Hachiōji | 579,355 | #26 |
| Katsushika | 453,093 | #39 |
| Machida | 431,079 | #42 |
| Kita | 332,140 | #70 |
| Fuchū | 262,790 | #92 |
| Minato City | 260,486 | #94 |
Cities near Iwai
- Akiruno81,912 people · ~2 km away
- Itsukaichi24,954 people · ~3 km away
- Ōme133,535 people · ~4 km away
- Hamura54,622 people · ~8 km away
- Fussa56,786 people · ~8 km away
- Hakonegasaki31,765 people · ~11 km away
FAQ
What is the population of Iwai?
Iwai has a population of 16,958 (city proper, latest official figure via GeoNames), making it the #1149 biggest city in Japan.
What region is Iwai in?
Iwai is located in Tokyo, Japan.
Is Iwai the capital of Japan?
No, the capital of Japan is Tokyo, about 42 km away.
Sources & notes
Population refers to the city proper (municipal boundaries), not the metropolitan area. Source: GeoNames (CC BY 4.0), retrieved 2026-07-07. Country data: UN World Population Prospects 2024.