Kawaguchi Population 2026
Kawaguchi has a population of 607,373, making it the #24 biggest city in 🇯🇵 Japan, located in Saitama. Roughly 0.5% of Japan's population lives here. It is about 16× smaller than Tokyo, the country's biggest city.
Population (city proper)
607,373
Rank in Japan
#24
Coordinates
35.81°N, 139.71°E
~6 m elevation · Asia/Tokyo
Distance to capital (Tokyo)
13 km
8 miles, straight line
Other big cities in Saitama
Cities near Kawaguchi
FAQ
What is the population of Kawaguchi?
Kawaguchi has a population of 607,373 (city proper, latest official figure via GeoNames), making it the #24 biggest city in Japan.
What region is Kawaguchi in?
Kawaguchi is located in Saitama, Japan.
Is Kawaguchi the capital of Japan?
No, the capital of Japan is Tokyo, about 13 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.