Koga: population and official figures
In depth
- Economy, jobs and prices in Koga: Taxable income for municipal resident tax in Koga averaged 3.35 million yen per taxpayer in fiscal 2024, 56th 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 Koga: Koga had 7 general hospitals (hospitals other than psychiatric ones) in 2023, or 5.02 per 100,000 residents, 128th highest of 262 cities, below the national figure (5.60).
- Education in Koga: Koga had 23 primary schools with 6,457 pupils and 499 full-time teachers in May 2024.
- Poverty and living standards in Koga: 31.0% of private households in Koga were one-person households at the 2020 census (17,361), 57th lowest of 262 cities, below the national figure (38.0%).
- Government budget and revenue in Koga: The municipal government of Koga took in 58.8 billion yen in fiscal 2022 (final accounts), 422,185 yen per resident, 85th lowest of 262 cities.
What is the population of Koga?
Koga had 139,344 residents at the 1 October 2020 census (city proper). That is 84th lowest of 262 cities. The count includes foreign residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow big is Koga and how densely populated is it?
Koga covers 123.58 square kilometres (2024), of which 115.88 is habitable land. That is 1,128 people per square kilometre of total area at the 2020 census, 116th lowest of 262 for density.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyIs the population of Koga growing or shrinking?
The basic resident register recorded 139,812 residents in Koga in 2024, 0.3% more 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 Koga?
11.6% of residents of Koga were under 15 (16,213 children) and 58.9% 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 Koga?
Koga had 56,149 households at the 2020 census, of which 56,075 were private households; that is about 2.48 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 Koga?
3,020 foreign nationals lived in Koga at the 2020 census, 2.2% of residents, above the national figure (1.9%).
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow many babies are born in Koga each year?
Koga recorded 689 births and 1,807 deaths in 2023, a natural decrease of 1,118. That is 4.9 births and 13.0 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 Koga?
In 2024, 4,687 people moved into Koga from other municipalities and 5,240 moved out, a net loss of 553 (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 Koga each year?
Koga registered 444 marriages and 193 divorces by Japanese nationals in 2023, or 3.2 marriages per 1,000 residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyWho runs Koga?
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
- Ashikaga 144,746
- Kakamigahara 144,521
- Kusatsu 143,913
- Moriguchi 143,096
- Okinawa 142,752
- Misato 142,145
- Tsuchiura 142,074
- Fujieda 141,342
- Fukaya 141,268
- Asaka 141,083
- Toda 140,899
- Ishinomaki 140,151
- Kuwana 138,613
- Shunan 137,540
- Minoh 136,868
- Yaizu 136,845
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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