Iruma: population and official figures
In depth
- Economy, jobs and prices in Iruma: Taxable income for municipal resident tax in Iruma averaged 3.53 million yen per taxpayer in fiscal 2024, 98th lowest of 262 cities and below the national average of 3,933.7 thousand yen per taxpayer. It is income before deductions, so it is not take-home pay.
- Health in Iruma: Iruma had 8 general hospitals (hospitals other than psychiatric ones) in 2023, or 5.49 per 100,000 residents, 107th highest of 262 cities, below the national figure (5.60).
- Education in Iruma: Iruma had 16 primary schools with 6,456 pupils and 413 full-time teachers in May 2024.
- Poverty and living standards in Iruma: 29.6% of private households in Iruma were one-person households at the 2020 census (18,075), 40th lowest of 262 cities, below the national figure (38.0%).
- Government budget and revenue in Iruma: The municipal government of Iruma took in 48.9 billion yen in fiscal 2022 (final accounts), 335,562 yen per resident, the lowest of 262 cities.
What is the population of Iruma?
Iruma had 145,651 residents at the 1 October 2020 census (city proper). That is 97th lowest of 262 cities. The count includes foreign residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow big is Iruma and how densely populated is it?
Iruma covers 44.69 square kilometres (2024), of which 37.95 is habitable land. That is 3,259 people per square kilometre of total area at the 2020 census, 79th highest of 262 for density.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyIs the population of Iruma growing or shrinking?
The basic resident register recorded 143,412 residents in Iruma in 2024, 1.5% fewer than the 2020 census count (all municipalities together: -1.4%). The register and the census are counted differently, so the change is indicative.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many children live in Iruma?
11.4% of residents of Iruma were under 15 (16,610 children) and 58.5% were aged 15 to 64 at the 2020 census; nationally the shares were 11.9% and 57.8%.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many households are there in Iruma?
Iruma had 61,222 households at the 2020 census, of which 61,159 were private households; that is about 2.38 residents per household (residents divided by all households).
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many foreigners live in Iruma?
2,023 foreign nationals lived in Iruma at the 2020 census, 1.4% of residents, below the national figure (1.9%).
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many babies are born in Iruma each year?
Iruma recorded 648 births and 1,641 deaths in 2023, a natural decrease of 993. That is 4.4 births and 11.3 deaths per 1,000 residents (national: 5.8 and 12.5). Births are by Japanese nationals registered in the city.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyAre more people moving into or out of Iruma?
In 2024, 4,671 people moved into Iruma from other municipalities and 5,160 moved out, a net loss of 489 (moves within the city and from abroad are not counted).
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many marriages are there in Iruma each year?
Iruma registered 403 marriages and 192 divorces by Japanese nationals in 2023, or 2.8 marriages per 1,000 residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyWho runs Iruma?
In Japan, cities and towns are run by municipalities: Mayor and municipal assembly both directly elected for four years. Primary and lower secondary schools, welfare, waste, water, residents' registers, disaster response. Large 'designated cities' (20) take on prefectural tasks and are divided into administrative wards whose heads are officials, not elected.
How local power works in Japan
Cities of a similar size in Japan
- Ueda 154,055
- Kariya 153,834
- Noda 152,638
- Kawanishi 152,321
- Higashimurayama 151,815
- Imabari 151,672
- Kuki 150,582
- Musashino 150,149
- Komaki 148,831
- Sayama 148,699
- Yonago 147,317
- Tama 146,951
- Ashikaga 144,746
- Kakamigahara 144,521
- Kusatsu 143,913
- Moriguchi 143,096
Up a level: all cities in Japan · Japan · government and power
Sources
- Statistics Bureau of Japan, Ministry of Internal Affairs and Communications: Statistical Observations of Municipalities 2026 (social and demographic statistics, city, ward, town and village data), read 28 October 2026 · saved copy (SHA-256 2cb3d8c51aa1…)
- Statistics Bureau of Japan, Ministry of Internal Affairs and Communications: Statistical Observations of Prefectures 2026 (national figures, "All Japan" row), read 28 October 2026 · saved copy (SHA-256 b69774a5f40c…)
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