Nagano-ken is a prefecture of Japan.
Boundaries: Natural Earth (naturalearthdata.com), public domain
| Azumino-Shi | Azumino | 99 k |
| Chiisakata-gun | no seat recorded | 2 subdistricts |
| Chikuma Shi | Chikuma | 62 k |
| Chino Shi | Chino | 56 k |
| Hanishina-gun | no seat recorded | 1 subdistrict |
| Higashichikuma Gun | no seat recorded | 5 subdistricts |
| Iida Shi | Iida | 106 k |
| Iiyama Shi | Iiyama | 23 k |
| Ina Shi | Ina | 70 k |
| Kamiina-gun | no seat recorded | 6 subdistricts |
| Kamiminochi-gun | no seat recorded | 3 subdistricts |
| Kamitakai-gun | no seat recorded | 2 subdistricts |
| Kiso-gun | no seat recorded | 6 subdistricts |
| Kitaazumi Gun | no seat recorded | 4 subdistricts |
| Kitasaku-gun | no seat recorded | 3 subdistricts |
| Komagane Shi | Komagane | 34 k |
| Komoro Shi | Komoro | 44 k |
| Matsumoto Shi | Matsumoto | 243 k |
| Minamisaku-gun | no seat recorded | 6 subdistricts |
| Nagano Shi | Nagano | 386 k |
| Nakano Shi | Nakano | 46 k |
| Okaya Shi | Okaya | 52 k |
| Ōmachi-shi | Ōmachi | 30 k |
| Saku Shi | Saku | 100 k |
| Shimoina-gun | no seat recorded | 13 subdistricts |
| Shimominochi-gun | no seat recorded | 1 subdistrict |
| Shimotakai-gun | no seat recorded | 3 subdistricts |
| Shiojiri-shi | Shiojiri | 68 k |
| Suwa-gun | no seat recorded | 3 subdistricts |
| Suwa Shi | Suwa | 51 k |
| Suzaka-shi | Suzaka | 52 k |
| Tōmi Shi | Tōmi | 31 k |
| Ueda Shi | Ueda | 161 k |
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