| Source | UN (World Urbanization Prospects 2018) |
| Date | 08 Mar 2025 |
| Code | City | Population | Share (%) | Rank | Change | |||
|---|---|---|---|---|---|---|---|---|
| 2024 | 2025 | Japan | World | Population | (%) | |||
| Toky | Tokyo | 37,115,035 | 37,036,204 | 30.1 | 1 | 1 | -78,831 | -0.21 |
| Kink | Kinki M.M.A. (Osaka) | 18,967,459 | 18,921,632 | 15.4 | 2 | 11 | -45,827 | -0.24 |
| Chuk | Chukyo M.M.A. (Nagoya) | 9,556,879 | 9,534,788 | 7.75 | 3 | 42 | -22,091 | -0.23 |
| Kita | Kitakyushu-Fukuoka M.M.A. | 5,478,076 | 5,465,918 | 4.44 | 4 | 88 | -12,158 | -0.22 |
| Shiz | Shizuoka-Hamamatsu M.M.A. | 2,935,527 | 2,930,172 | 2.38 | 5 | 195 | -5,355 | -0.18 |
| Sapp | Sapporo | 2,660,947 | 2,653,577 | 2.16 | 6 | 217 | -7,370 | -0.28 |
| Send | Sendai | 2,341,433 | 2,337,586 | 1.90 | 7 | 249 | -3,847 | -0.16 |
| Hiro | Hiroshima | 2,062,884 | 2,058,192 | 1.67 | 8 | 283 | -4,692 | -0.23 |
| Niig | Niigata | 795,916 | 793,974 | 0.645 | 9 | 815 | -1,942 | -0.24 |
| Kuma | Kumamoto | 736,779 | 735,149 | 0.597 | 10 | 889 | -1,630 | -0.22 |
| Okay | Okayama | 720,343 | 718,616 | 0.584 | 11 | 906 | -1,727 | -0.24 |
| Kago | Kagoshima | 581,211 | 578,881 | 0.470 | 12 | 1142 | -2,330 | -0.40 |
| Utsu | Utsunomiya | 518,834 | 517,568 | 0.420 | 13 | 1271 | -1,266 | -0.24 |
| Mats | Matsuyama | 503,659 | 502,185 | 0.408 | 14 | 1308 | -1,474 | -0.29 |
| Oita | Oita | 475,472 | 474,415 | 0.385 | 15 | 1380 | -1,057 | -0.22 |
| Kura | Kurashiki | 471,431 | 470,339 | 0.382 | 16 | 1388 | -1,092 | -0.23 |
| Kana | Kanazawa | 462,233 | 461,142 | 0.375 | 17 | 1421 | -1,091 | -0.24 |
| Fuku | Fukuyama | 461,529 | 460,453 | 0.374 | 18 | 1425 | -1,076 | -0.23 |
| Taka | Takamatsu | 415,595 | 414,621 | 0.337 | 19 | 1553 | -974 | -0.23 |
| Toya | Toyama | 407,299 | 405,849 | 0.330 | 20 | 1582 | -1,450 | -0.36 |
| Naga | Nagasaki | 399,994 | 396,587 | 0.322 | 21 | 1615 | -3,407 | -0.85 |
| Miya | Miyazaki | 395,600 | 394,714 | 0.321 | 22 | 1624 | -886 | -0.22 |
| Toyo | Toyohashi | 366,303 | 365,196 | 0.297 | 23 | 1721 | -1,107 | -0.30 |
| Naga | Nagano | 365,698 | 364,210 | 0.296 | 24 | 1724 | -1,488 | -0.41 |
| Taka | Takasaki | 365,016 | 364,200 | 0.296 | 25 | 1725 | -816 | -0.22 |
| Iwak | Iwaki | 355,187 | 354,272 | 0.288 | 26 | 1753 | -915 | -0.26 |
| Kori | Koriyama | 325,221 | 323,937 | 0.263 | 27 | 1834 | -1,284 | -0.39 |
| Maeb | Maebashi | 324,463 | 323,018 | 0.262 | 28 | 1838 | -1,445 | -0.45 |
| Asah | Asahikawa | 322,338 | 320,288 | 0.260 | 29 | 1840 | -2,050 | -0.64 |
| Koch | Kochi | 322,061 | 320,242 | 0.260 | 30 | 1841 | -1,819 | -0.56 |
| Naha | Naha | 318,539 | 317,702 | 0.258 | 31 | 1847 | -837 | -0.26 |
| Kuru | Kurume | 302,245 | 301,528 | 0.245 | 32 | 1856 | -717 | -0.24 |
| Akit | Akita | 298,421 | 296,371 | 0.241 | 33 | 1860 | -2,050 | -0.69 |