Niigata
| Arai, Niigata | 0255 |
| Gosen, Niigata | 0250 |
| Higashikanbara District, Niigata | 02549 |
| Higashikubiki District, Niigata | 0255 |
| Higashikubiki District, Niigata | 02559 |
| Itoigawa, Niigata | 0255 |
| Iwafune District, Niigata | 0235 |
| Iwafune District, Niigata | 0254 |
| Jōetsu, Niigata | 0255 |
| Kamo, Niigata | 0256 |
| Kariwa District, Niigata | 0257 |
| Kariwa District, Niigata | 0258 |
| Kashiwazaki, Niigata | 0257 |
| Kitakanbara District, Niigata | 025 |
| Kitakanbara District, Niigata | 0254 |
| Kitauonuma District, Niigata | 02579 |
| Kitauonuma District, Niigata | 0258 |
| Koshi District, Niigata | 0258 |
| Minamikanbara District, Niigata | 0256 |
| Minamiuonuma District, Niigata | 0257 |
| Minamiuonuma District, Niigata | 0258 |
| Mitsuke, Niigata | 0258 |
| Murakami, Niigata | 0254 |
| Nagaoka, Niigata | 0258 |
| Nakakanbara District, Niigata | 0250 |
| Nakakubiki District, Niigata | 0255 |
| Nakauonuma District, Niigata | 0257 |
| Niigata, Niigata | 025 |
| Niitsu, Niigata | 0250 |
| Nishikanbara District, Niigata | 025 |
| Nishikubiki District, Niigata | 0255 |
| Ojiya, Niigata | 0258 |
| Ryotsu, Niigata | 0259 |
| Sado, Niigata | 0259 |
| Sanjō, Niigata | 0256 |
| Santō District, Niigata | 0258 |
| Sato District, Niigata | 0256 |
| Shibata, Niigata | 0254 |
| Shirone, Niigata | 025 |
| Tochio, Niigata | 0258 |
| Tōkamachi, Niigata | 0257 |
| Toyosaka, Niigata | 025 |
| Tsubame, Niigata | 0256 |
Read more about this topic: List Of Dialing Codes In Japan