| City | 2026 Pop. ↓ |
|---|---|
| Tokyo | 10,316,210 |
| Toyota | 570,086 |
| Takamatsu | 563,561 |
| Toyama | 558,758 |
| Takasaki | 503,461 |
| Toyohashi | 502,039 |
| Toyonaka | 408,976 |
| Tokorozawa | 398,065 |
| Tsu | 370,586 |
| Takatsuki | 369,745 |
| Tokushima | 340,692 |
| Tsukuba | 326,201 |
| Tottori | 254,401 |
| Toyokawa | 249,266 |
| Takarazuka | 241,031 |
| Takaoka | 224,607 |
| Tomakomai | 210,669 |
| Tochigi | 209,969 |
| Tachikawa | 195,491 |
| Tsuchiura | 191,780 |
| Tsuruoka | 165,151 |
| Tama | 152,336 |
| Toda | 146,870 |
| Tajimi | 144,073 |
| Toride | 141,093 |
| Tondabayashi | 137,483 |
| Tokai | 132,487 |