Koriyama's 2025 population is now estimated at 323,937. In 1950, the population of Koriyama was 70,900. Koriyama experienced a decrease of -1,284 residents over the past year, marking an annual decline of -0.39%.These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Koriyama, which typically includes Koriyama's population in addition to adjacent suburban areas.
| City | 2025 Pop. ↓ | Growth |
|---|---|---|
| Tokyo | 37,036,200 | -0.21% |
| Osaka | 18,921,600 | -0.24% |
| Nagoya | 9,534,790 | -0.23% |
| Fukuoka | 5,465,920 | -0.22% |
| Shizuoka | 2,930,170 | -0.18% |
| Sapporo | 2,653,580 | -0.28% |
| Sendai | 2,337,590 | -0.16% |
| Hiroshima | 2,058,190 | -0.23% |
| Niigata | 793,974 | -0.24% |
| Kumamoto | 735,149 | -0.22% |
| Okayama | 718,616 | -0.24% |
| Kagoshima | 578,881 | -0.4% |
| Utsunomiya | 517,568 | -0.24% |
| Matsuyama | 502,185 | -0.29% |
| Oita | 474,415 | -0.22% |
| Kurashiki | 470,339 | -0.23% |
| Kanazawa | 461,142 | -0.24% |
| Fukuyama | 460,453 | -0.23% |
| Takamatsu | 414,621 | -0.23% |
| Toyama | 405,849 | -0.36% |
