Ōi Population 2026
Ōi has a population of 50,593, making it the #546 biggest city in 🇯🇵 Japan, located in Saitama. It is about 192× smaller than Tokyo, the country's biggest city.
Population (city proper)
50,593
Rank in Japan
#546
Coordinates
35.85°N, 139.52°E
~21 m elevation · Asia/Tokyo
Distance to capital (Tokyo)
24 km
15 miles, straight line
Other big cities in Saitama
Cities near Ōi
- Kamifukuoka52,323 people · ~2 km away
- Miyoshidai38,434 people · ~3 km away
- Niiza166,017 people · ~5 km away
- Fujimino113,597 people · ~6 km away
- Shiki76,445 people · ~6 km away
- Kawagoe354,571 people · ~7 km away
FAQ
What is the population of Ōi?
Ōi has a population of 50,593 (city proper, latest official figure via GeoNames), making it the #546 biggest city in Japan.
What region is Ōi in?
Ōi is located in Saitama, Japan.
Is Ōi the capital of Japan?
No, the capital of Japan is Tokyo, about 24 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.