60 cities
| City | 2025 Pop. ↓ |
|---|---|
| Iwaki | 354,272 |
| Ichihara | 283,531 |
| Ichinomiya | 280,331 |
| Ibaraki | 273,992 |
| Itami | 193,524 |
| Izumi | 189,085 |
| Isesaki | 130,692 |
| Ikoma | 117,601 |
| Ishinomaki | 117,233 |
| Iwatsuki | 108,833 |
| Iida | 107,111 |
| Iwakuni | 104,004 |
| Isehara | 103,401 |
| Inazawa | 102,130 |
| Izumisano | 100,595 |
| Ikeda | 99,476 |
| Isahaya | 97,371 |
| Ise | 97,314 |
| Izumo | 89,286 |
| Iwata | 88,509 |
| Iwamizawa | 85,107 |
| Izumiotsu | 80,772 |
| Iizuka | 78,206 |
| Inuyama | 73,995 |
| Ito | 71,578 |
| Imaichi | 64,323 |
| Ichinoseki | 62,970 |
| Ina | 62,104 |
| Imaricho-ko | 57,940 |
| Ishikari | 57,301 |
| Itoman | 57,184 |
| Iwade | 55,633 |
| Ishioka | 52,304 |
| Iwakura | 48,007 |
| Inashiki | 46,994 |
| Ishigaki | 44,802 |
| Iwai | 42,497 |
| Iwanuma | 42,411 |
| Izumi | 39,217 |
| Ibara | 34,424 |
| Itoigawa | 30,865 |
| Iyo | 30,760 |
| Ibusuki | 29,710 |
| Isawa | 29,616 |
| Ishii | 26,394 |
| Innoshima | 26,141 |
| Itako | 25,791 |
| Iiyama | 25,281 |
| Ijuin | 25,217 |
| Itsukaichi | 24,954 |
| Ishige | 24,948 |
| Ino | 24,123 |
| Ishiki | 23,966 |
| Ishikawa | 22,412 |
| Iwase | 21,980 |
| Ishikawa | 18,817 |
| Inawashiro | 17,413 |
| Ikedacho | 15,895 |
| Ichinohe | 15,825 |
| Iwanai | 15,584 |