| Postal Code | Area | |
|---|---|---|
| 012-1133 | Tokomai (床舞) | View |
| 012-1134 | Tazawa (田沢) | View |
| 012-1135 | Shikanai (鹿内) | View |
| 012-1136 | Iizawa (飯沢) | View |
| 012-1137 | Nishimonai Horimawari (西馬音内堀回) | View |
| 012-1241 | Tashiro (田代) | View |
| 012-1242 | Kamitomai (上到米) | View |
| 012-1243 | Karuisawa (軽井沢) | View |
| 012-1351 | Shimosendo (下仙道) | View |
| 012-1352 | Nakasendo (中仙道) | View |
| 012-1353 | Kamisendo (上仙道) | View |