Kosai Population 2026

Kosai has a population of 59,770, making it the #470 biggest city in 🇯🇵 Japan, located in Shizuoka. It is about 163× smaller than Tokyo, the country's biggest city.

Location of Kosai (capital Tokyo shown for reference). Boundaries: Natural Earth.

Population (city proper)

59,770

Rank in Japan

#470

Coordinates

34.70°N, 137.52°E

~30 m elevation · Asia/Tokyo

Distance to capital (Tokyo)

226 km

140 miles, straight line

Other big cities in Shizuoka

City	Population	Rank in Japan
Hamamatsu	791,707	#17
Shizuoka	693,389	#23
Fuji	245,392	#98
Numazu	189,486	#130
Iwata	166,672	#153
Fujieda	145,032	#176
Yaizu	139,578	#188
Fujinomiya	132,507	#200

Cities near Kosai

Arai16,975 people · ~4 km away
Toyohashi377,453 people · ~15 km away
Toyokawa184,661 people · ~17 km away
Hamamatsu791,707 people · ~19 km away
Shinshiro44,355 people · ~22 km away
Tahara60,206 people · ~24 km away

FAQ

What is the population of Kosai?

Kosai has a population of 59,770 (city proper, latest official figure via GeoNames), making it the #470 biggest city in Japan.

What region is Kosai in?

Kosai is located in Shizuoka, Japan.

Is Kosai the capital of Japan?

No, the capital of Japan is Tokyo, about 226 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.

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