| Code | Name | Region |
|---|---|---|
| JPYZU | Yaizu | 22 |
| JPKUM | Yakushima | 46 |
| JPYKU | Yakuzu | 46 |
| JPYQD | Yamada | 28 |
| JPYAD | Yamada, Iwate | 3 |
| JPYMD | Yamada, Okayama | 33 |
| JPGAJ | Yamagata | 6 |
| JPYUF | Yamagata | 21 |
| JPYAM | Yamagawa | 46 |
| JPWJM | Wajima | 17 |
| JPWTU | Wakamatsu, Nagasaki | 42 |
| JPWAM | Wakamatsu/kitakyushu | 40 |
| JPWKS | Wakasa Fukui | 18 |
| JPWKT | Wakatsu | 40 |
| JPWAK | Wakayama | 30 |
| JPWKE | Wake | 33 |
| JPWKI | Wakimisaki | 42 |
| JPWMT | Wakimoto | 38 |
| JPWKW | Wakinosawa | 2 |
| JPWKZ | Wakizaki | 46 |
| JPWKJ | Wakkanai | 1 |
| JPWOT | Wako | 11 |
| JPWKR | Wakura | 17 |
| JPWAN | Wan | 46 |
| JPWNI | Waniura | 42 |
| JPWNA | Wano | 46 |
| JPOUI | Wanouchi, Gifu | 21 |
| JPWIR | Warabi | 11 |
| JPWSB | Washibeyanoura | 34 |
| JPUSA | Usa/tosa | 39 |
| JPUBK | Ushibuka | 43 |
| JPUSG | Ushigakubijima | 37 |
| JPUSH | Ushimado | 33 |
| JPUSI | Ushine | 46 |
| JPUST | Ushitsu | 17 |
| JPUSJ | Usujiri | 1 |
| JPUKA | Usuka | 42 |
| JPUSK | Usuki | 44 |
| JPUSN | Usuno | 44 |
| JPUSU | Usunoura | 42 |
| JPUTZ | Utazu | 37 |
| JPUTM | Utsumi, Aichi | 23 |
| JPUTS | Utsumi, Hiroshima | 34 |
| JPUTO | Utsunomiya | 9 |
| JPUWA | Uwajima | 38 |
| JPUZK | Uzuki | 32 |
| JPWDA | Wada | 18 |
| JPWAD | Wadomari | 46 |
| JPWAI | Waita | 35 |
| JPUOM | Uomi | 46 |