| Code | Name | Region |
|---|---|---|
| JPTMM | Tomiku | 44 |
| JPTMO | Tomioka, Kumamoto | 43 |
| JPTOM | Tomioka, Tokushima | 36 |
| JPTMU | Tomitsu | 43 |
| JPTMY | Tomiya | 4 |
| JPTNM | Tonami | 16 |
| JPTND | Tonda | 35 |
| JPTDY | Tondabayashi | 27 |
| JPWTN | Tono | 3 |
| JPTNO | Tonosho | 37 |
| JPTNH | Tonoshohigash | 37 |
| JPTON | Tonoura | 45 |
| JPTOO | Toon, Ehime | 38 |
| JPTOR | Toride | 8 |
| JPTRO | Tororo | 43 |
| JPTSL | Tosa, Kochi | 39 |
| JPTSZ | Tosashimizu | 39 |
| JPTJO | Toshima, Hyogo | 28 |
| JPTOX | Toshima/tokyo | 13 |
| JPTOW | Tokokawa | 23 |
| JPTXN | Tokoname | 23 |
| JPTKO | Tokonami | 42 |
| JPTKR | Tokoro | 1 |
| JPTWZ | Tokorozawa | 11 |
| JPTCC | Tokuchi | 47 |
| JPTKJ | Tokujin | 47 |
| JPTKN | Tokunoshima | 46 |
| JPTKS | Tokushima | 36 |
| JPTKY | Tokuyama | 35 |
| JPTXD | Tokuyamakudamatsu | 35 |
| JPTYO | Tokyo | 13 |
| JPTKX | Tokyo-to | 13 |
| JPTMK | Tomakomai | 1 |
| JPTJJ | Tomamae | 1 |
| JPTMR | Tomari, Okinawa | 47 |
| JPTMA | Tomari/shiribeshi | 1 |
| JPTRR | Tomariura | 39 |
| JPTSE | Tome-shi | 4 |
| JPTME | Tomie | 42 |
| JPTBM | Tobishima-mura | 23 |
| JPTBO | Tobo | 41 |
| JPTGI | Tochigi, Tochigi | 9 |
| JPTTD | Toda | 11 |
| JPTOD | Todohokke | 1 |
| JPTOJ | Toga | 5 |
| JPTOC | Togane | 12 |
| JPTOG | Togi | 17 |
| JPTGC | Toguchi | 46 |
| JPTDA | Tohda | 32 |
| JPTOI | Toi | 22 |