Otsu: population and official figures
In depth
- Economy, jobs and prices in Otsu: Taxable income for municipal resident tax in Otsu averaged 3.98 million yen per taxpayer in fiscal 2024, 55th highest of 262 cities and above 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 Otsu: Otsu had 13 general hospitals (hospitals other than psychiatric ones) in 2023, or 3.77 per 100,000 residents, 77th lowest of 262 cities, below the national figure (5.60).
- Education in Otsu: Otsu had 38 primary schools with 18,480 pupils and 1,182 full-time teachers in May 2024.
- Poverty and living standards in Otsu: 32.7% of private households in Otsu were one-person households at the 2020 census (47,764), 90th lowest of 262 cities, below the national figure (38.0%).
- Government budget and revenue in Otsu: The municipal government of Otsu took in 144.2 billion yen in fiscal 2022 (final accounts), 417,773 yen per resident, 78th lowest of 262 cities.
What is the population of Otsu?
Otsu had 345,070 residents at the 1 October 2020 census (city proper). That is 60th highest of 262 cities. The count includes foreign residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyHow big is Otsu and how densely populated is it?
Otsu covers 464.51 square kilometres (2024), of which 123.73 is habitable land. That is 743 people per square kilometre of total area at the 2020 census, 81st lowest of 262 for density.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyIs the population of Otsu growing or shrinking?
The basic resident register recorded 343,600 residents in Otsu in 2024, 0.4% 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 Otsu?
13.2% of residents of Otsu were under 15 (45,482 children) and 58.0% 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 Otsu?
Otsu had 146,088 households at the 2020 census, of which 145,891 were private households; that is about 2.36 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 Otsu?
4,035 foreign nationals lived in Otsu at the 2020 census, 1.2% 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 Otsu each year?
Otsu recorded 2,334 births and 3,575 deaths in 2023, a natural decrease of 1,241. That is 6.8 births and 10.4 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 Otsu?
In 2024, 11,627 people moved into Otsu from other municipalities and 10,562 moved out, a net gain of 1,065 (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 Otsu each year?
Otsu registered 1,215 marriages and 495 divorces by Japanese nationals in 2023, or 3.5 marriages per 1,000 residents.
Source: Statistics Bureau of Japan, Ministry of Internal Affairs and Communications · saved copyNotes from the UN table: Excluding diplomatic personnel outside the country and foreign military and civilian personnel and their dependants stationed in the area. For the 2020 census, urban areas are “Densely Inhabited Districts”, defined as areas within a municipality that is composed of a group of contiguous Basic Unit Blocks, each of which has a population density of 4,000 inhabitants or more per square kilometer and whose total population exceeds 5,000 as of 1 October 2020. The detailed methodological explanation is available at https://www.stat.go.jp/english/data/chiri/did/1-1.html Excluding diplomatic personnel outside the country and foreign military and civilian personnel and their dependants stationed in the area. For the 2020 census, urban areas are “Densely Inhabited Districts”, defined as areas within a municipality that is composed of a group of contiguous Basic Unit Blocks, each of which has a population density of 4,000 inhabitants or more per square kilometer and whose total population exceeds 5,000 as of 1 October 2020. The detailed methodological explanation is available at https://www.stat.go.jp/english/data/chiri/did/1-1.html Excluding diplomatic personnel outside the country and foreign military and civilian personnel and their dependants stationed in the area. For the 2020 census, urban areas are “Densely Inhabited Districts”, defined as areas within a municipality that is composed of a group of contiguous Basic Unit Blocks, each of which has a population density of 4,000 inhabitants or more per square kilometer and whose total population exceeds 5,000 as of 1 October 2020. The detailed methodological explanation is available at https://www.stat.go.jp/english/data/chiri/did/1-1.html Land areas are based on the "Municipalities Area Statistics of Japan, 2015" published by the Geospatial Information Authority of Japan, Ministry of Land, Infrastructure, Transport and Tourism.
Who runs Otsu?
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
- Hirakata 397,289
- Yokosuka 388,078
- Suita 385,567
- Okazaki 384,654
- Ichinomiya 380,073
- Takasaki 372,973
- Nagano 372,760
- Toyohashi 371,920
- Wakayama 356,729
- Nara 354,630
- Kawagoe 354,571
- Takatsuki 352,698
- Tokorozawa 342,464
- Koshigaya 341,621
- Iwaki 332,931
- Maebashi 332,149
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…)
Each saved copy is the file exactly as downloaded, kept so the figures can be checked even if the source changes. Report an error.