Ibaraki茨城県
Koga 古河市
Data last updated:
2020
(Census)
139,396
2030
(Projection)
130,866
▼ -6.1%
2040
(Projection)
119,713
▼ -14.1%
2050
(Projection)
107,859
▼ -22.6%
Other municipalities in Ibaraki (茨城県)
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.
About Koga
Overview
Koga (古河市) is a municipality in Ibaraki, Japan, with a population of 139,396 as of 2020.
Population Projection
According to projections by Japan's National Institute of Population and Social Security Research (IPSS), Koga's population is expected to reach 130,866 by 2030 (-6.1%), 119,713 by 2040 (-14.1%), and 107,859 by 2050 (-22.6%). A significant population decline is projected over the next three decades.
Aging Outlook
The aging rate (percentage of residents aged 65 and over) is 28.7% as of 2020 and is projected to rise to 39.0% by 2050. The aging rate will remain below the most severe Japanese averages.
National Comparison
Koga's population decline rate exceeds the national average.