Iwai Population 2026

Iwai has a population of 42,497, making it the #642 biggest city in 🇯🇵 Japan, located in Ibaraki. It is about 229× smaller than Tokyo, the country's biggest city.

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

Population (city proper)

42,497

Rank in Japan

#642

Coordinates

36.05°N, 139.90°E

~5 m elevation · Asia/Tokyo

Distance to capital (Tokyo)

44 km

27 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
Koga	139,344	#189
Toride	104,524	#260

Cities near Iwai

Bandō57,128 people · ~4 km away
Jōsō60,834 people · ~6 km away
Mitsukaidō41,147 people · ~8 km away
Ishige24,948 people · ~10 km away
Sakai24,201 people · ~11 km away
Noda154,114 people · ~12 km away

FAQ

What is the population of Iwai?

Iwai has a population of 42,497 (city proper, latest official figure via GeoNames), making it the #642 biggest city in Japan.

What region is Iwai in?

Iwai is located in Ibaraki, Japan.

Is Iwai the capital of Japan?

No, the capital of Japan is Tokyo, about 44 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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