Koga Population 2026

Koga has a population of 139,344, making it the #189 biggest city in 🇯🇵 Japan, located in Ibaraki. Roughly 0.1% of Japan's population lives here. It is about 70× smaller than Tokyo, the country's biggest city.

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

Population (city proper)

139,344

Rank in Japan

#189

Coordinates

36.18°N, 139.72°E

~17 m elevation · Asia/Tokyo

Distance to capital (Tokyo)

55 km

34 miles, straight line

Other big cities in Ibaraki

City	Population	Rank in Japan
Mito	270,685	#88
Tsukuba	241,656	#103
Hitachi	174,508	#140
Hitachi-Naka	156,581	#163
Katsuta	155,968	#164
Tsuchiura	144,399	#179
Toride	104,524	#260
Chikusei	100,753	#271

Cities near Koga

Kurihashi27,813 people · ~6 km away
Fujioka18,335 people · ~10 km away
Washinomiya36,544 people · ~11 km away
Sakai24,201 people · ~12 km away
Satte55,286 people · ~12 km away
Kazo112,792 people · ~13 km away

FAQ

What is the population of Koga?

Koga has a population of 139,344 (city proper, latest official figure via GeoNames), making it the #189 biggest city in Japan.

What region is Koga in?

Koga is located in Ibaraki, Japan.

Is Koga the capital of Japan?

No, the capital of Japan is Tokyo, about 55 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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