Kochi高知県
Kouchi 高知市
Data last updated:
Kouchi, Kochi, Japan has a population of 309,085 (2025 national census). IPSS projections estimate 298,280 by 2030 and 241,483 by 2050 (a decrease of about 26.0% from 2020), with the share of residents aged 65+ rising from 30.2% in 2020 to 42.4%.Sources: Japan Census (Statistics Bureau), IPSS Regional Population Projections (2023)
2025
(Census)
309,085
2030
(Projection)
298,280
▼ -8.7%
2040
(Projection)
270,644
▼ -17.1%
2050
(Projection)
241,483
▼ -26.0%
Change vs. 2020 census
Enter your age
See the population of 高知市 when you turn 50, 60, 70 and 80.
Other municipalities in Kochi (高知県)
Data Sources
- Portal Site of Official Statistics of Japan (e-Stat)（https://www.e-stat.go.jp/）
- National Institute of Population and Social Security Research (IPSS), Regional Population Projections (2023 ed.)
* This service uses the e-Stat API but its content is not guaranteed by the Japanese government.
Kouchi Population Table (1980–2050)
Population by year: national census results (restated to current municipal boundaries) and IPSS (2023) projections based on the 2020 census.
| Year | Population | vs 2020 | Type |
|---|---|---|---|
| 1980 | 318,266 | ▼ -2.5% | Census |
| 1985 | 330,956 | ▲ +1.4% | Census |
| 1990 | 335,287 | ▲ +2.7% | Census |
| 1995 | 339,864 | ▲ +4.1% | Census |
| 2000 | 348,979 | ▲ +6.9% | Census |
| 2005 | 348,990 | ▲ +6.9% | Census |
| 2010 | 343,393 | ▲ +5.2% | Census |
| 2015 | 337,190 | ▲ +3.3% | Census |
| 2020 | 326,545 | — | Census |
| 2025 | 309,085 | ▼ -5.3% | Census |
| 2030 | 298,280 | ▼ -8.7% | Projection |
| 2035 | 284,864 | ▼ -12.8% | Projection |
| 2040 | 270,644 | ▼ -17.1% | Projection |
| 2045 | 255,989 | ▼ -21.6% | Projection |
| 2050 | 241,483 | ▼ -26.0% | Projection |
About Kouchi
Overview
Kouchi (高知市) is a municipality in Kochi, Japan, with a population of 309,085 as of 2025.
Population Projection of Kouchi
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Kouchi's population is expected to reach 298,280 by 2030 (-8.7%), 270,644 by 2040 (-17.1%), and 241,483 by 2050 (-26.0%). A significant population decline is projected over the next three decades.
Aging Rate of Kouchi
The aging rate (percentage of residents aged 65 and over) is 30.2% as of 2020 and is projected to rise to 42.4% by 2050. Over 40% of residents will be elderly, significantly affecting healthcare and social services needs.
National Comparison
Kouchi's population decline rate exceeds the national average.
National and Prefectural Rank
- Population decline rate: Ranked #1176 out of 1903 municipalities nationwide.
- Aging rate in 2050: Ranked #1065 out of 1903 nationwide.
- Population size: Ranked #83 out of 1917 nationwide.
- Related: National rankings / All municipalities in Kochi
Earnings in Kochi (高知県): Average salary in Kochi (高知県) by age, gender and company sizejpsalary / MHLW Basic Survey on Wage Structure