| Code | Name | Region |
|---|---|---|
| JPYTI | Yutai | 38 |
| JPYUU | Yuu | 35 |
| JPYWN | Yuwan | 46 |
| JPYUZ | Yuza | 6 |
| JPZWA | Yuzawa, Akita | 5 |
| JPYNW | Yuzawa, Niigata | 15 |
| JPZAM | Zama | 14 |
| JPZMM | Zamami | 47 |
| JPAXZ | Zushi | 14 |
| JPYOU | Youra | 44 |
| JPYAZ | Yuasa | 30 |
| JPYSH | Yuasahiro | 30 |
| JPYBT | Yubetsu | 1 |
| JPYDM | Yudomari | 46 |
| JPYGE | Yuge | 38 |
| JPYKI | Yuki | 8 |
| JPYUK | Yuki | 36 |
| JPYKH | Yukuhashi | 40 |
| JPYMC | Yumachi | 32 |
| JPYMU | Yumugi | 46 |
| JPYNM | Yunomochiki | 46 |
| JPYNT | Yunotsu | 32 |
| JPYRA | Yura, Hyogo | 28 |
| JPYUR | Yura, Wakayama | 30 |
| JPYUJ | Yura, Yamagata | 6 |
| JPYUA | Yura, Yamaguchi | 35 |
| JPYRG | Yurigahama | 46 |
| JPYIO | Yurihonjo, Akita | 5 |
| JPYUS | Yusu | 38 |
| JPYNZ | Yonouzu | 44 |
| JPYRR | Yorii | 11 |
| JPYRO | Yoro | 21 |
| JPYOR | Yoro | 46 |
| JPRNJ | Yoronjima | 46 |
| JPYSS | Yoshiase | 34 |
| JPYDA | Yoshida, Aichi | 23 |
| JPYSD | Yoshida, Ehime | 38 |
| JPYOA | Yoshikawa | 11 |
| JPYSM | Yoshima | 37 |
| JPYOZ | Yoshino, Nara | 29 |
| JPYOW | Yoshinogawa Tokushima | 36 |
| JPYSN | Yoshinozaki | 37 |
| JPYHI | Yoshiumi | 38 |
| JPYSU | Yoshiura | 34 |
| JPYSR | Yoshiura/misumi | 32 |
| JPYHA | Yoshiura/yunotsu | 32 |
| JPYSZ | Yoshizu | 24 |
| JPYKD | Yotsukaido, Chiba | 12 |
| JPYOT | Yotsukura | 7 |
| JPYAT | Yatsushiro | 43 |