Koshigaya Population 2026
Koshigaya has a population of 345,353, making it the #65 biggest city in 🇯🇵 Japan, located in Saitama. Roughly 0.3% of Japan's population lives here. It is about 28× smaller than Tokyo, the country's biggest city.
Population (city proper)
345,353
Rank in Japan
#65
Coordinates
35.89°N, 139.79°E
~7 m elevation · Asia/Tokyo
Distance to capital (Tokyo)
24 km
15 miles, straight line
Other big cities in Saitama
Cities near Koshigaya
- Matsubushi28,787 people · ~4 km away
- Yoshikawa73,262 people · ~5 km away
- Sōka249,645 people · ~6 km away
- Hatogaya-honchō53,062 people · ~8 km away
- Yashio93,363 people · ~9 km away
- Noda154,114 people · ~10 km away
FAQ
What is the population of Koshigaya?
Koshigaya has a population of 345,353 (city proper, latest official figure via GeoNames), making it the #65 biggest city in Japan.
What region is Koshigaya in?
Koshigaya is located in Saitama, Japan.
Is Koshigaya 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.