Yamagata
| Akumi District, Yamagata | 0234 |
| Higashimurayama District, Yamagata | 023 |
| Higashimurayama District, Yamagata | 0236 |
| Higashimurayama District, Yamagata | 0237 |
| Higashine, Yamagata | 0237 |
| Higashiokitama District, Yamagata | 0238 |
| Higashitagawa District, Yamagata | 0234 |
| Higashitagawa District, Yamagata | 0235 |
| Kaminoyama, Yamagata | 023 |
| Kitamurayama District, Yamagata | 0237 |
| Mogami District, Yamagata | 023 |
| Mogami District, Yamagata | 0234 |
| Murayama, Yamagata | 0237 |
| Nagai, Yamagata | 0238 |
| Nan'yō, Yamagata | 0238 |
| Nishimurayama District, Yamagata | 0237 |
| Nishiokitama District, Yamagata | 0238 |
| Nishitagawa District, Yamagata | 0235 |
| Obanazawa, Yamagata | 0237 |
| Sagae, Yamagata | 0237 |
| Sakata, Yamagata | 0234 |
| Shinjō, Yamagata | 0233 |
| Tendō, Yamagata | 023 |
| Tendō, Yamagata | 0237 |
| Tsuruoka, Yamagata | 0235 |
| Yamagata, Yamagata | 023 |
| Yonezawa, Yamagata | 0238 |
Read more about this topic: List Of Dialing Codes In Japan